Communist International

The Communist International (abbreviated as Comintern), also known as the Third International, was a Marxist political international that advocated world communism and existed from 1919 to 1943. Emerging from the collapse of the Second International during World War I, it was founded at a congress in Moscow convened by Vladimir Lenin and the Russian Communist Party (Bolsheviks) (RCP), which aimed to create a new international body committed to revolutionary socialism and the overthrow of capitalism worldwide.

Initially, the Comintern operated with the expectation of imminent proletarian revolutions in post-war Europe, particularly in the former German Empire, which were seen as crucial for the survival and success of the Russian Revolution. Its early years were characterized by attempts to foment and coordinate revolutionary uprisings and the establishment of disciplined communist parties across the globe, often demanding strict adherence to the "Twenty-one Conditions" for admission. As these revolutionary hopes faded by the early 1920s, the Comintern's policies shifted, notably with the adoption of the "united workers' front" tactic, aiming to win over the working masses from reformist socialist parties. Throughout the 1920s, the Comintern underwent a process of "Bolshevization", increasing the centralization of its structure and the dominance of the RCP within its ranks. This process intensified with the rise to power of Joseph Stalin in the Soviet Union.

The "Third Period" (1928–1933) saw the Comintern adopt an ultra-sectarian line and denounce social democratic parties as "social fascism". From 1934, the Comintern shifted to the Popular Front policy, advocating broad alliances with socialist and even liberal parties against fascism. This was formally adopted at its Seventh World Congress in 1935. The Comintern played a significant role in organizing support for the Republican side in the Spanish Civil War, including the formation of the International Brigades. However, this period also coincided with the Great Purge in the Soviet Union, during which many Comintern officials and foreign communists residing in Moscow were arrested and executed.

With the signing of the Nazi–Soviet Pact in August 1939, the Comintern again changed its line, denouncing the war between Nazi Germany and the Western powers as an "imperialist war" and abandoning its anti-fascist stance until the German invasion of the Soviet Union in June 1941. As a gesture to its Allies in World War II, Stalin unilaterally dissolved the Comintern on 15 May 1943. While its formal structures were dismantled, mechanisms of Soviet control over the international communist movement persisted and were later partially revived through the Cominform (1947–1956).

Background

The Communist International, or Third International, was a direct descendant of the First International (1864–1876) and the Second International (1889–1914). The First International, of which Karl Marx and Friedrich Engels were leading figures, aimed to coordinate the proletariat in its worldwide struggle against capitalism, based on the premise that "the working men have no country" and that horizontal class allegiance would supersede vertical national divisions. By the late 19th century, however, the Western labour movement had largely abandoned the revolutionary zeal of the First International. Powerful trade unions and socialist parties emerged which, while often adhering to Marxist revolutionary theory, in practice pursued the implementation of gradual, constitutional reforms, improving the workers' lot within the existing capitalist framework. This created a manifest contradiction between revolutionary rhetoric and peaceful practice.

The Second International, created in 1889, was a looser federation of autonomous socialist parties, comprising "left", "right", and "centrist" factions, divided on issues such as bourgeois democracy, the national question, general strikes, and, crucially, war. It foundered in August 1914 on the rock of national chauvinism when most of its constituent parties chose to support their respective national governments in World War I by voting for war credits. Vladimir Lenin, a key figure in the Russian Bolshevik Party (later the Russian Communist Party, RCP), viewed this as a "sheer betrayal of socialism" and declared the Second International dead, calling for a Third International by the autumn of 1914.

During the war, anti-war socialists attempted to regroup at the Zimmerwald Conference in 1915 and the Kienthal Conference in 1916. At Zimmerwald, a divide emerged between a pacifist majority, which sought an immediate peace without annexations or indemnities, and Lenin's left-wing minority, which advocated turning the imperialist war into a revolutionary civil war. Lenin's position gained more support at Kienthal, and the Zimmerwald Left laid the ideological foundations for the future Third International.

The Bolsheviks emerged from a distinct Russian revolutionary tradition. Unlike the mass-based, reformist parties of the West, Russian revolutionaries operated in a clandestine underground, organized in small, disciplined groups of "professional revolutionaries". Drawn largely from the intelligentsia of the Russian Empire, this movement possessed a quasi-religious devotion to the cause of revolution itself, an enthusiasm that contrasted sharply with the practical, matter-of-fact nature of Western labour movements. The October Revolution of 1917 in Russia, led by the Bolsheviks, was seen by Lenin as the first act of a global drama, with European workers expected to follow suit. To achieve this, a new International, purged of reformist "traitors", was deemed an absolute necessity.

Foundation and early years (1919–1923)

The Communist International was founded at a congress of revolutionaries in Moscow from 2–6 March 1919. The impetus for its creation came from the Bolsheviks' belief in the imminence of world proletarian revolution, spurred by the perceived collapse of capitalism after World War I and revolutionary upheavals across Europe, particularly the German "November Revolution". The mission of the Comintern was to build a "world party" of communists dedicated to the armed overthrow of capitalist private property and its replacement by a system of collective ownership.

First (Founding) Congress

thumb|Delegates at the First (Founding) Congress, 1919

On 24 January 1919, a "Letter of Invitation to the First Congress of the Communist International" was sent by wireless from Moscow, identifying thirty-nine communist parties and revolutionary groups eligible to attend; it was deliberately timed to pre-empt the Berne Conference, held in early February by reformist socialists attempting to revive the Second International. The congress convened in the Kremlin on 2 March 1919. Of the fifty-one delegates, only nine arrived from abroad due to the Allied blockade of Russia; the rest resided in Soviet Russia, and many lacked authorized credentials. Hugo Eberlein, the delegate of the Communist Party of Germany (KPD), was mandated to oppose the immediate formation of a new International, reflecting Rosa Luxemburg's earlier concerns that a premature founding would allow the Bolsheviks to dominate the new organization. Despite Eberlein's abstention, the congress voted overwhelmingly to establish the Third International on 4 March 1919.

The principal document of the congress was Leon Trotsky's "Manifesto to the Proletariat of the Entire World", which emphasized soviets (workers' councils) as the instrument of working-class unity and action, deeming the Russian model universally applicable. It dismissed "bourgeois democracy" and reiterated Lenin's insistence on the dictatorship of the proletariat. Unusually, the Manifesto made no explicit reference to the role of national Communist Parties, instead placing its emphasis on the soviets on one hand and, on the other, the "International Communist Party" whose task was to overthrow the capitalist order. The improvised nature of the congress meant that no formal statutes or rules were adopted, but an Executive Committee (ECCI) was elected, with Grigory Zinoviev as its first President. While provision was made for foreign party representation on the ECCI, Bolsheviks predominated due to the prestige of the Russian Revolution and the weakness of foreign parties.

Universalisation of Bolshevism

The foundation of the Comintern institutionalized the split in the international labour movement between revolutionary communists and reformist social democrats. This schism was rooted in fundamentally different conceptions of the path to socialism. Karl Kautsky, a leading theoretician of the Second International, condemned the Bolshevik coup in The Dictatorship of the Proletariat (1918), arguing that socialism was inseparable from democracy and that a revolution in backward Russia could only result in a terroristic dictatorship. Lenin, in his reply The Proletarian Revolution and the Renegade Kautsky (1918), excoriated Kautsky, asserting that parliamentary institutions were a sham concealing bourgeois class rule and that "proletarian democracy is a million times more democratic than any bourgeois democracy". He proclaimed that Bolshevism could "serve as a model of tactics for all". Rosa Luxemburg, while a committed revolutionary, also criticized the Bolsheviks from a democratic standpoint, warning that their centralist organizational model would lead to a bureaucratic dictatorship over the proletariat, not of it.

thumb|Delegates at the Second World Congress, 1920

The Second World Congress, held in Petrograd and Moscow from 19 July to 7 August 1920, is considered the true founding congress of the Comintern. Many delegates undertook hazardous, illegal journeys through the Allied blockade and civil war to attend, with some travelling for weeks to reach Russia. The congress itself took place amidst the privations of War Communism, but the Bolsheviks staged impressive cultural spectacles, such as a mass performance depicting the history of class struggle, to foster revolutionary enthusiasm among the delegates and the domestic population.

The congress adopted the famous "Twenty-one Conditions" for admission, drafted primarily by Zinoviev under Lenin's guidance. These conditions, a "much more stringent and deterrent set" than the initial platform, aimed to split the rank-and-file of European socialist parties from their "opportunist" leaders and enforce Bolshevik organizational principles. Key conditions included: systematic removal of reformists and centrists from all responsible posts; combining legal and illegal activity; a complete break with figures like Kautsky and Ramsay MacDonald; establishing communist cells in trade unions; adherence to democratic centralism based on iron discipline and periodic purges; unconditional support for every Soviet republic; and changing party names to "Communist Party". Point sixteen stated that all decisions of Comintern congresses and the ECCI were binding on all parties. The congress also ratified the Statutes of the Comintern, which established the annual world congress as the supreme body and the ECCI as the directing body between congresses. Point 8 of the Statutes stipulated that the work of the ECCI was performed mainly by the party of the country where it was located (Soviet Russia), which had five representatives with full voting rights, while other major parties had only one.

This "universalisation of Bolshevism" was further elaborated in Lenin's pamphlet "Left-Wing" Communism: An Infantile Disorder (April 1920), which argued that "certain fundamental features of our revolution have a significance that is not local... but international". The Third (June–July 1921) and Fourth (November–December 1922) Congresses reinforced the centralist Bolshevik model, creating ECCI bodies like the Presidium, Secretariat, Organisational Bureau (Orgburo), and International Control Commission (ICC) that paralleled Russian party structures. The Comintern also began dispatching "agents" and "emissaries" to intervene in the affairs of national parties. Funding for foreign communist parties and the Comintern's clandestine activities, managed by the International Liaison Department (OMS) from 1921, came from the Soviet state treasury, creating economic dependence.

Despite the trend towards Russian dominance and centralisation, the Comintern in Lenin's era displayed a degree of pluralism and open debate not seen later. Figures like Paul Levi of the KPD and the Italian Amadeo Bordiga were not docile, and some national parties resisted or reinterpreted Moscow's directives.

"United workers' front"

thumb|[[Vladimir Lenin addressing the Third World Congress, 1921]]

By late 1920 and into 1921, with the failure of revolutionary upheavals in Europe (such as the factory occupations in Italy and the "March Action" in Germany in 1921), Lenin reluctantly concluded that proletarian revolution was no longer on the immediate agenda. This led to the adoption of the "united workers' front" policy, formally expounded in ECCI theses on 18 December 1921. The policy aimed to win over the majority of the working class by engaging in joint defensive struggles with socialist rank-and-file against the capitalist offensive. It allowed for temporary alliances with reformist leaders ("united front from above") but primarily focused on unity "from below". The slogan of the Third Congress (1921) was "To the masses!".

The United Front policy was closely intertwined with changes in Soviet domestic and foreign policy, particularly the New Economic Policy (NEP) and the search for trade relations with capitalist nations. The Rapallo Treaty of April 1922 between Germany and Soviet Russia epitomized the growing tension between the Comintern's revolutionary goals and Soviet state interests. The United Front tactics faced intense opposition from left-wing elements in many communist parties (e.g., in France and Italy), who found it inconceivable to court the "social chauvinists". The Comintern's trade union arm, the Profintern (Red International of Labour Unions), founded on Lenin's initiative at the Second Congress in 1920, played a crucial role in applying United Front tactics in the industrial field, though this often led to splits in national trade union movements, as in Czechoslovakia and France.

A conference of the three Internationals (Second, Comintern, and the Vienna Union or "Two-and-a-half International") in Berlin in April 1922, aimed at creating common action, failed amidst mutual suspicion and recriminations. The Communists, led by Karl Radek, denounced the "social patriots", who in turn condemned the persecution of Socialist Revolutionaries and Mensheviks in Russia and the Soviet invasion of the Social Democratic republic of Georgia. Despite the hostility, a temporary Committee of Nine (three from each International) was formed to explore further steps towards unity, but it met only once in May 1922 and achieved nothing, with the Comintern soon withdrawing.

The "German October" of 1923, a failed Comintern-inspired uprising in Germany, revealed fundamental limitations in Comintern thinking, including inadequate military preparations and a misjudgment of the German workers' mood. This debacle convinced many Bolsheviks, notably Joseph Stalin, that European revolution was a distant prospect, reinforcing the priority of defending the Soviet state.

Bolshevisation and Stalin's rise (1924–1928)

The period from 1924 to 1928 was characterized by the "Bolshevisation" of the Comintern and its member sections. This entailed an increasing Russian dominance, the Russification of ideological and organizational structures, and the canonization of Leninist principles of party unity, discipline, and democratic centralism, particularly the concentration of power in the hands of the Russian party delegation to the ECCI.

Impact of Soviet inner-party struggles

thumb|Lenin, [[Nikolai Bukharin, and Grigory Zinoviev at the Second World Congress]]

The failure of the "German October" and Lenin's death in January 1924 intensified inner-party struggles in the Soviet Union, which profoundly affected the Comintern. The triumvirate of Zinoviev, Lev Kamenev, and Stalin moved against Trotsky and his supporters. At an ECCI Presidium session in January 1924, Zinoviev attributed the German failure to the "opportunism" of Radek, Heinrich Brandler, and August Thalheimer, implicating Trotsky by association. "Trotskyism" was branded a "right deviation".

The slogan of "Bolshevisation" was officially proclaimed at the Fifth Comintern Congress (June–July 1924). In practice, it meant creating centralized, disciplined Leninist organizations fiercely loyal to the RCP majority in its struggle against the "Trotskyite opposition". Zinoviev declared the need for "iron discipline" and the eradication of "social-democratism, federalism, 'autonomy'". This led to a series of denunciations and expulsions: Brandler and Thalheimer were removed from the KPD leadership, replaced by leftists Arkadi Maslow and Ruth Fischer; Boris Souvarine was expelled from the French party; and Polish leaders like Adolf Warski were condemned.

The Fifth Congress also marked a tactical shift to the left regarding the United Front. The Theses on Tactics rejected united fronts "solely from above" and re-emphasized the united front "from below" under communist party leadership as a means to unmask reformist "bosses". Radek was removed from the ECCI, and Trotsky was demoted to non-voting status, replaced by Stalin.

thumb|upright|[[Joseph Stalin in the 1920s]]

However, the period 1925–1926 saw a tentative move back to the centre under Nikolai Bukharin's growing influence in the Comintern, emphasizing a broader conception of the United Front. It has been suggested that the failures of the Comintern to export proletarian revolution across the globe prompted Stalin to resort to the doctrine of "socialism in one country", first propounded in December 1924. This theory argued that the Soviet Union could build socialism without the need for immediate world revolution, and that the main task of communist parties was to defend the USSR. This fundamentally altered the strategic orientation of the international communist movement, subordinating the goal of world revolution to the defence and construction of the USSR, which was now considered the essential factor in that revolution. In order to sustain this "essential factor" its rapid industrialization was imperative but could not be achieved without normalizing diplomatic and economic relations with the developed capitalist countries, which in turn demanded taming the Comintern so that the attempts at exporting proletarian revolutions into them cease.

First (Founding) Congress: Moscow, 2–6 March 1919
Second World Congress: Petrograd and Moscow, 19 July – 7 August 1920
Third World Congress: Moscow, 22 June – 12 July 1921
Fourth World Congress: Petrograd and Moscow, 5 November – 5 December 1922
Fifth World Congress: Moscow, 17 June – 8 July 1924
Sixth World Congress: Moscow, 17 July – 1 September 1928
Seventh World Congress: Moscow, 25 July – 21 August 1935

The ECCI also convened thirteen Enlarged Plenums between 1922 and 1933, which served as important decision-making forums between congresses:

First Enlarged Plenum: Moscow, 24 February – 4 March 1922
Second Enlarged Plenum: Moscow, 7–11 June 1922
Third Enlarged Plenum: Moscow, 12–23 June 1923
Fourth Enlarged Plenum: Moscow, 12–13 July 1924
Fifth Enlarged Plenum: Moscow, 21 March – 6 April 1925
Sixth Enlarged Plenum: Moscow, 17 February – 15 March 1926
Seventh Enlarged Plenum: Moscow, 22 November – 16 December 1926
Eighth Enlarged Plenum: Moscow, 18–30 May 1927
Ninth Enlarged Plenum: Moscow, 9–25 February 1928
Tenth Enlarged Plenum: Moscow, 3–19 July 1929
Eleventh Enlarged Plenum: Moscow, 26 March – 11 April 1931
Twelfth Enlarged Plenum: Moscow, 27 August – 15 September 1932
Thirteenth Enlarged Plenum: Moscow, 28 November – 12 December 1933

Organization

The Comintern was designed to be a centralized "world party". Its supreme body was the World Congress, which was supposed to meet annually (later less frequently) to decide on program and policy. Between congresses, the Comintern was directed by its Executive Committee (ECCI). The ECCI, in turn, elected a Presidium to handle day-to-day affairs, and a Secretariat. Other important bodies included the Organisational Bureau (Orgburo) and the International Control Commission (ICC), which was responsible for discipline and ideological purity. The International Liaison Department (, OMS), established in 1921, managed the Comintern's clandestine activities, including funding, communications, and forging documents. The ECCI and its subsidiary bodies were based in Moscow. The statutes stipulated that the Communist Party of the host country (the Soviet Union) would have a disproportionate influence, holding five seats on the ECCI, while other major parties held one. National communist parties were considered "sections" of the Comintern, bound by its decisions.

By the early 1930s, the parties' social composition had shifted significantly. Following the "Third Period" policy and the Great Depression, many parties were transformed from organizations of employed industrial workers into parties of the unemployed. In Germany, the percentage of factory workers in the KPD dropped from over 62% in 1928 to around 20% in 1931. The parties were also characterized by an extremely high membership turnover, or "fluctuation". The entire membership of most parties was almost completely renewed every few years, with only a small nucleus of about 5% remaining constant, preventing the formation of stable traditions and cadres independent of Moscow. Between 1921 and 1931, the total membership of the Comintern's non-Soviet parties declined from 887,000 to 328,000. For context, the rival Labour and Socialist International claimed an affiliated membership of over 6.2 million in 1928, with a total electoral vote of 25.6 million. The Comintern's finances, however, far exceeded those of its socialist rival; its income in 1927 was over twenty-six times greater, drawing on the resources of the Soviet state.

Member parties

{| class="wikitable sortable"

|+ Member parties of the Communist International

! Country/Region

! Organization name

! Years of affiliation

! Notes

| Albanian Communist Party (PKSh)

| 1941–1943

| Founded in 1941, succeeding an Albanian communist group founded in Moscow in 1928.

| Algerian Communist Party (PCA)

| 1920–1943

| The Algerian Federation of the French Section of the Workers' International (SFIO) voted to join the Comintern in 1920, becoming a federation of the French Communist Party. It was transformed into the Communist Party of Algeria in 1935 and adopted the name Algerian Communist Party in 1936.

| Communist Party of Argentina (PCA)

| 1919–1943

| Founded as the International Socialist Party in January 1918. Changed its name to Communist Party of Argentina in December 1918.

| Communist Party of Armenia (HKP)

| 1920–1943

| Founded in 1920. Became a pseudo-autonomous part of the Russian Communist Party (Bolshevik) in 1922.

| Communist Party of Australia (CPA)

| 1922–1943

| Founded in 1920. Briefly known as the United Communist Party of Australia in 1922. It was the "Communist Party of Australia, Section of the Communist International" from 1922 to 1944.

| Communist Party of Austria (KPÖ)

| 1919–1943

| Founded in 1918 as the Communist Party of German Austria. Changed name in 1919. It went underground in 1933.

| Communist Party of Belgium (PCB)

| 1921–1943

| Founded in 1921. It operated illegally underground during the German occupation (1940–1945).

| Communist Party of Belorussia (KPB)

| 1919–1943

| Founded in 1918 as a part of the Russian Communist Party (Bolshevik).

| Brazilian Communist Party (PCB)

| 1922–1943

| Founded in 1922.

| Bulgarian Communist Party (BKP)

| 1919–1943

| The Bulgarian Social Democratic Workers' Party (Narrow Socialists) was founded in 1903. It was renamed the Bulgarian Communist Party in 1919. It was dissolved in 1924, reappeared as the legal Workers' Party in 1927, and was dissolved again in 1934, continuing illegally as the Bulgarian Workers' Party (Communist).

| Communist Party of Burma (CPB)

| 1939–1943

| Founded circa 1939.

| Communist Party of Canada (CPC)

| 1921–1943

| Founded as an illegal party in 1921. The legal Workers' Party of Canada acted as its public branch from 1922 to 1924. The party was legalized in 1924 but was forced underground by government repression from 1931 to 1934. It was banned in 1940 and revived as the Labor-Progressive Party in 1943.

| Ceylon Communist Party (LKP)

| 1943

| A Stalinist party founded in 1943. The earlier Ceylon Equality Party (founded 1935) was a Trotskyist organization and not a Comintern member.

| Communist Party of Chile (PCCh)

| 1922–1943

| The Socialist Workers' Party of Chile was founded in 1912 and changed its name to the Communist Party of Chile in 1922.

| Chinese Communist Party (CCP)

| 1921–1943

| Founded in 1921. It was never formally outlawed, but was persecuted by various warlords.

| Communist Party of Colombia (PCC)

| 1928–1943

| The Socialist Revolutionary Party was founded in 1926 and joined the Comintern in 1928. It changed its name to the Communist Party of Colombia in 1930.

| Communist Party of Costa Rica (PCCR)

| 1935–1943

| Founded in 1929. Changed its name to the Popular Vanguard Party in 1943.

| Communist Party of Cuba (PCC)

| 1925–1943

| A Communist Group of Havana was founded in 1923, which adopted the name Communist Party of Cuba in 1925. Went underground in 1935. It was re-legalized in 1938 and changed its name to the Popular Socialist Party in 1944.

| Communist Party of Cyprus (KKK)

| 1926–1941

| Founded in 1926. Outlawed by British authorities in 1931 and disintegrated from 1935–36. It reappeared in 1941 as the Progressive Party of Working People but was not a Comintern member under this guise.

| Communist Party of Czechoslovakia (KSČ)

| 1921–1943

| Founded in 1921 from several communist groups. Outlawed by the Czechoslovak government and later the German occupation authorities from 1938–45.

| Communist Party of Denmark (DKP)

| 1920–1943

| Founded in 1920. Operated underground during the German occupation.

| Dominican Communist Party (PCD)

| 1942–1943

| Founded clandestinely in 1942, succeeding a communist group formed by Spanish Civil War refugees in 1939.

| Communist Party of Ecuador (PCE)

| 1928–1943

| A left faction of the Ecuadorian Socialist Party joined the Comintern in 1928. It established itself as the Communist Party of Ecuador in 1931 and operated clandestinely.

| Egyptian Communist Party (ECP)

| 1921–1925

| Founded in 1921. It was suppressed by British authorities and disintegrated by 1925.

| Communist Party of El Salvador (PCES)

| 1930–1943

| Began in the mid-1920s as part of a proposed Communist Party of Central America; the Salvadoran party was formally founded in 1930.

| Communist Party of Estonia (EKP)

| 1920–1943

| Founded in 1920 from an Estonian Section of the Russian Bolshevik party. Remained illegal until 1940 when it was incorporated as a section into the Communist Party of the Soviet Union.

| Finnish Communist Party (SKP)

| 1919–1943

| Founded in Moscow in 1918; it was illegal in Finland but active underground.

| French Communist Party (PCF)

| 1921–1943

| Founded in 1921. Outlawed by the French government, and later the German occupation authorities, from 1939 to 1944.

| Communist Party of Georgia (KPG)

| 1920–1943

| A Bolshevik Party of Georgia was founded in 1920 when Georgia was independent. The Communist Party (Bolshevik) of Georgia was founded after the Soviet invasion in 1921.

| Communist Party of Germany (KPD)

| 1919–1943

| Founded in 1918. A split in 1919 produced the short-lived Communist Workers' Party of Germany (KAPD). A left-wing of the Independent Social Democratic Party of Germany (USPD) merged with the KPD in 1920 to form the United Communist Party of Germany. The KPD was outlawed from 1933–45.

| Communist Party of Greece (KKE)

| 1920–1943

| The Socialist Labour Party of Greece was founded in 1918. It voted to affiliate with the Comintern in 1920, and changed its name to the Communist Party of Greece in 1924. It went underground from 1936–44.

| Communist Party of Honduras (PCH)

| 1927–1932

| Founded in 1927. Destroyed by government repressions in 1932.

| Communist Party of Hungary (KMP)

| 1919–1943

| Founded in Moscow in March 1918. A separate party was founded in Hungary in November 1918, becoming the ruling party of the Hungarian Soviet Republic (March–August 1919). It went underground after the republic's collapse. It was dissolved by the Comintern in 1922, reorganized in 1925, and its leadership was moved to Prague in 1936.

| Communist Party of Iceland (KFI)

| 1930–1943

| A small faction of the Social Democratic Party affiliated with the Comintern in 1921 but was ordered not to secede. The Communist Party of Iceland was founded in 1930. In 1938, it merged to form the People's Unity Party – Socialist Party.

| Communist Party of India (CPI)

| 1928–1943

| Founded in 1928. It was declared illegal and operated underground from 1934 to 1942.

|Indochinese Communist Party (ICP)

|1930–1943

|Founded in Hong Kong in 1930 by the merger of various communist groups, and active in Cambodia, Laos, and Vietnam. It established the Viet Minh in 1941, and was dissolved in 1945.

| Communist Party of Indonesia (PKI)

| 1920–1943

| The Marxist-oriented Indies Social Democratic Organization was founded in 1914. It adopted the name Communist Party of the Indies in 1920 and Communist Party of Indonesia in 1924. It was banned by the Dutch government in 1927 and operated underground.

| Communist Party of Persia (HKI)

| 1920–1943

| The first congress was held in Soviet-occupied territory in 1920. It went underground after 1931.

| Iraqi Communist Party (CPI)

| 1935–1943

| A Committee to Combat Imperialism and Exploitation was founded in 1934 and changed its name to the Communist Party of Iraq in 1935.

| Communist Party of Ireland (CPI)

| 1933–1940

| Founded in 1933. It was disbanded in the southern Irish Free State by the government in 1940 but continued in Ulster as the Communist Party of Northern Ireland.

| Italian Communist Party (PCI)

| 1921–1943

| Founded in 1921 from a split in the Italian Socialist Party. It was forced underground by fascist government repression from 1926 to 1943.

| Japanese Communist Party (JCP)

| 1922–1943

| Founded as an illegal party in 1922.

|Communist Party of Kazakhstan (KKP)

|1921–1943

|Founded in 1921. Became a regional organization of the All-Union Communist Party (Bolshevik) in 1925.

|Communist Party of Kirghizia (KKP)

|1919–1943

|Founded as the Communist Party (Bolshevik) of Turkestan in 1918. It was renamed the Communist Party (Bolshevik) of Kirgizia in 1937.

| Communist Party of Korea (CKD)

| 1925–1928

| Founded in Seoul in 1925 as an illegal organization. It was decimated by Japanese government repressions, and its recognition was rescinded by the Comintern in 1928.

| Communist Party of Latvia (LKP)

| 1919–1940

| Founded in 1919 from elements of the Latvian Social Democratic Workers' Party. It operated underground until 1940, when it was incorporated as a branch of the All-Union Communist Party (Bolshevik).

| Syrian–Lebanese Communist Party (PCSL)

| 1924–1943

| Founded in 1924 as the Lebanese People's Party. It later became the Syrian–Lebanese Communist Party. In 1944, it divided into separate Lebanese and Syrian parties.

| Communist Party of Lithuania (LKP)

| 1919–1940

| Founded in 1918 as the Communist Party of Lithuania and Belorussia. It emerged as a separate party in 1920 and operated underground until 1940, when it was incorporated into the All-Union Communist Party (Bolshevik).

| Communist Party of Luxembourg (PCL)

| 1921–1943

| Founded in 1921 from a split in the Luxembourg Social Democratic Party. It went underground during the German occupation.

| Communist Party of Malaya (CPM)

| 1930–1943

| Founded in 1930, succeeding the South Seas Communist Party founded in 1928.

| Martinican Communist Party (PCM)

| 1925–1943

| The Jean Jaurès Communist Group was founded in 1923 and became a section of the French Communist Party in 1925. It was dissolved by the French government in 1939.

| Mexican Communist Party (PCM)

| 1920–1943

| Founded in 1920 from several communist groups.

| Moroccan Communist Party (PCM)

| 1936–1943

| The "Moroccan region" of the French Communist Party was founded in 1936 and dissolved in 1939. It was revived as the Moroccan Communist Party in 1943.

| Communist Party of the Netherlands (CPN)

| 1919–1943

| Founded as the Communist Party of Holland in 1918. It was renamed in 1935 and went underground during the German occupation.

| Communist Party of New Zealand (CPNZ)

| 1926–1943

| Founded in 1921. It was a section of the Communist Party of Australia in 1924, but regained independence in 1926.

| Socialist Party of Nicaragua (PSN)

| 1937–1943

| Founded in 1937. It was suppressed by the government from 1939 to 1945.

| Communist Party of Norway (NKP)

| 1923–1943

| Founded in 1923 from a split in the Norwegian Labor Party. It went underground during the German occupation.

| Mongolian People's Revolutionary Party (MPRP)

| 1921–1943

| The Mongolian People's Party was founded in 1921 and changed its name to the Mongolian People's Revolutionary Party in 1924.

| Palestine Communist Party (PCP)

| 1922–1943

| Founded in 1922. It operated as separate Jewish and Arab groups from 1939 to 1948.

| Communist Party of Panama (PCP)

| 1935–1943

| Founded in 1930. Affiliated with the Comintern in 1935.

| Paraguayan Communist Party (PCP)

| 1928–1943

| Founded in 1928. Outlawed in 1936.

| Peruvian Communist Party (PCP)

| 1930–1943

| Founded as the Peruvian Socialist Party in 1928 and renamed in 1930.

| Communist Party of the Philippines (PKP)

| 1930–1943

| Founded in 1930. It was declared illegal in 1932 but its legal status was restored in 1938.

| Communist Party of Poland (KPP)

| 1919–1938

| Founded as the Communist Workers' Party of Poland in 1918. It changed its name in 1925. The Comintern disbanded it in 1938. The Polish Workers' Party was revived in Moscow in 1941 and "founded" in Warsaw in 1942.

| Portuguese Communist Party (PCP)

| 1921–1943

| Founded in 1921. It has been outlawed several times.

| Romanian Communist Party (PCR)

| 1921–1943

| Founded in 1921. It operated underground until 1944.

| Communist Party of Slovakia (KSS)

| 1938–1943

| Founded after Slovakia declared independence in 1938. It operated underground during the war.

| Communist Party of South Africa (CPSA)

| 1921–1943

| Founded as the Communist Party of Africa in 1921.

| Spanish Communist Party (PCE)

| 1920–1943

| The Federation of Socialist Youth adopted the name Spanish Communist Party in April 1920. In July 1920, the Spanish Communist Workers' Party was founded. The two merged in 1921 as the Communist Party of Spain. It was outlawed several times.

| Communist Party of Sweden (SKP)

| 1919–1943

| The Social Democratic Left Party of Sweden joined the Comintern in 1919 and changed its name to the Communist Party of Sweden in 1921. A split from 1929 to 1934 produced two rival communist parties.

| Communist Party of Switzerland (KPS)

| 1921–1940

| Founded in 1921. It was outlawed in 1940 and revived as the Swiss Party of Labour in 1944.

| Communist Party of Turkestan (KPT)

| 1919–1929

| The Communist Party of Turkestan was founded in 1918. The regional party organization became an adjunct of the All-Union Communist Party (Bolshevik) in 1929.

| Communist Party of Thailand (CPT)

| 1942–1943

| Founded in 1942.

| Tunisian Communist Party (PCT)

| 1920–1943

| Founded as the Tunisian Federation of the French Communist Party in 1920. It became the Communist Party of Tunisia in 1934 and was dissolved by French authorities in 1939, resuming legal activities in 1943.

| Communist Party of Turkey (TKP)

| 1920–1943

| An Executive Committee of Turkish Socialist-Communists was established in Moscow in 1918, becoming the Turkish Communist Party in 1920. Separately, the Turkish Communist Party was founded in Istanbul in 1920 and operated illegally.

| Communist Party of Turkmenistan (KPT)

| 1920–1943

| Founded in 1920 as a section of the Russian Communist Party (Bolshevik).

| Communist Party of Ukraine (KPU)

| 1919–1943

| Founded in April 1918, independent of the Russian Communist Party (Bolshevik). In July 1918, it became an autonomous part and in 1919 a regional organization within the Russian party.

| Communist Party of the Soviet Union (CPSU)

| 1919–1943

| The Russian Social Democratic Labour Party (RSDLP) split into Bolsheviks and Mensheviks in 1903. The Bolshevik faction adopted the name Russian Communist Party (Bolshevik) in 1918, which became the All-Union Communist Party (Bolsheviks) in 1925. Its branches included the communist parties of Armenia, Belorussia, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan.

| Communist Party of Great Britain (CPGB)

| 1920–1943

| Founded in 1920. It was never outlawed.

| Communist Party USA (CPUSA)

| 1919–1943

| The Communist Party of America and the Communist Labor Party were founded in 1919 and driven underground in 1920. After several mergers, they emerged in the legal Workers' Party of America in 1923, which became the Communist Party of the United States of America in 1926.

| Communist Party of Uruguay (PCU)

| 1920–1943

| Founded in 1920. It has never changed its name and has never been outlawed.

| Communist Party of Uzbekistan (KPU)

| 1919–1943

| The Bukharan Communist Party and the Communist Party (Bolshevik) of Turkestan were founded in 1918. They merged with the Russian Communist Party (Bolshevik) in 1922. The Communist Party of Uzbekistan was founded in 1925 as a section of the Russian party.

| Communist Party of Venezuela (PCV)

| 1935–1943

| Founded in 1931. Affiliated with the Comintern in 1935.

| Communist Party of Yugoslavia (KPJ)

| 1919–1943

| Founded in April 1919 as the Socialist Workers' Party of Yugoslavia (Communist). It changed its name to the Communist Party of Yugoslavia in 1920 and operated underground until 1945.

Bureaus and training schools

In addition to its central apparatus in Moscow, the Comintern established several regional bureaus to coordinate its activities. Among the most important was the Berlin-based West European Secretariat (WES), founded in October 1919 under the leadership of Yakov Reich ("Thomas"). It served as a critical hub for communications, finance, and propaganda, channeling funds (including cash and diamonds) and directives from Moscow to the emerging communist parties in Europe. In the early 1920s, Weimar Berlin, with its large working-class movement and relatively loose controls, became the Comintern's most important outpost and a center for its transnational network of agents. The WES was reorganized in 1927 as the West European Bureau (WEB), with a much clearer line of political control from Moscow. Other bureaus included the Scandinavian Bureau, a Southern Bureau in Kiev, the Vienna Bureau, the Balkan Bureau, the Amsterdam Bureau, the Central Asian Bureau in Tashkent, and the Far Eastern Bureau, based for much of its existence in Shanghai.

A crucial part of the Comintern's structure was its system of political schools, designed to train cadres from around the world in communist theory and practice. The immense importance of this schooling was a key feature of the organization, as it produced a worldwide cadre of loyal communists. The four principal schools were:

Communist University of the Toilers of the East (KUTV, 1921–1937) provided political education for cadres from Soviet Eastern republics and later admitted candidates from colonial and independent countries in the Middle East and Eastern Mediterranean.
Communist University of the National Minorities of the West (KUNMZ, 1921–1936) initially trained cadres from the western national minorities of Soviet Russia, but later expanded to include militants from the Balkans, Italy, Central Europe, and Scandinavia.
Moscow Sun Yat-sen University (1925–1930) specialized in training Chinese revolutionaries.
International Lenin School (1926–1938), the Comintern's most advanced political school, training leading cadres from various communist parties.

Historiography

The historiography of the Comintern is diverse and has evolved significantly, particularly with the opening of Soviet archives in the late 1980s. Early Western scholarship during the Cold War often depicted the Comintern as a monolithic tool of Soviet foreign policy, and found official Soviet historiography sanitized and ideologically controlled. Dissident communist critiques, such as those by former members like Franz Borkenau or Trotskyist writers, often focused on the Comintern's degeneration under Stalin compared to an idealized Leninist phase.

Other studies, including those by E. H. Carr and Fernando Claudin, offer more nuanced interpretations. Carr analyzed the Comintern's relationship with Soviet foreign policy, allowing for a degree of autonomous action by Comintern leaders and national parties. Claudin, in his Marxist analysis, argued that the Comintern was marked by a "crisis of theory" from its inception, as it failed to differentiate between Russian and Western European conditions leading to flawed strategies.

The opening of the Comintern archives in Moscow spurred new research, often confirming the extent of Soviet control, particularly under Stalin, but also revealing internal debates within the Comintern apparatus and complexities in the relationship between the center and national sections. There is ongoing debate about the degree of autonomy retained by national parties and the interplay between Moscow's directives and indigenous factors in shaping communist policies. More recent scholarship has also adopted a transnational and global history perspective, focusing on the Comintern as a network and on the lives and experiences of cadres operating across borders, treating the organization as a unique "lifeworld" with its own practices and culture.

Legacy

The Comintern's legacy is another site of ongoing debate. In the 1920s it nurtured a range of theoretical responses to contemporary problems from figures like Trotsky, Bukharin, and Antonio Gramsci. Opponents claim the Comintern transformed from an instrument for world revolution into an instrument of Soviet foreign policy, particularly under Stalin, undergoing processes of Bolshevisation and centralisation that led to the demotion, expulsion, and purging of those who resisted Moscow's line. The Comintern supported the Soviet Union through contentious acts like the Great Purge and the Nazi–Soviet Pact, and its hostility towards syndicalism and other currents of revolutionary socialism drove out figures like Alfred Rosmer, Pierre Monatte, Ángel Pestaña, and Martin Tranmæl. Democratic socialist historian G. D. H. Cole argues that the Comintern's "social fascism" theory helped fascism come to power in Italy and Germany by deliberately setting out to split the world's socialist movements, seeing reformists and centrists as "social traitors" and dividing working class forces.

Trotskyists and other anti-Soviet Leninists claim the Comintern universalised a Bolshevik model specific to Russian conditions, the core reason for the Comintern's failures and a Stalinist "ossification" of Marxist thought that hindered the development of strategies more applicable to diverse national conditions. Others blame not just Stalin but Leninism itself, finding the Leninist party structure and its associated dogmas an enduring constraint on communist parties adapting to changing post-war realities. Socialist historian Julius Braunthal argued that Lenin's doctrine "wrecked the unity of the international workers movement... and, in Italy and Germany, paved the way for Fascism".

The Comintern ultimately failed to achieve its original aims of worldwide socialist revolution and colonial liberation, overseeing a series of disappointments such as the German October of 1923 and the British General Strike of 1926. Nonetheless, the Comintern represented a unique historical experiment in creating a global and transnational network supporting emancipatory movements, and gave a voice to oppressed groups such as the working class, women, and the peoples of the colonies. During the Popular Front era and World War II, communists were among the most active anti-fascists, notably organizing the International Brigades in the Spanish Civil War, though this support was also used to enforce Soviet orthodoxy and suppress other left-wing groups. The threat of communism may also have spurred capitalist governments to undertake social reforms. After World War II, communism expanded significantly, with organized communists numbering fourteen million outside the Soviet Union by the end of 1945. This growth was partly due to the Soviet war effort and the groundwork laid by the Comintern in consolidating disciplined communist parties.

References

Works cited

External links

Comintern History Archive Marxists Internet Archive

Lenin's speech: The Third, Communist International ()
Site Comintern Archives
Site Comintern Archives
Program of the Communist International. Together With Its Constitution (adopted at 6th World Congress in 1928)
The Communist International Journal of the Comintern, Marxists Internet Archive
Outline History of the Communist International
The Internationale by R. Palme Dutt, 1964
Report from Moscow, 3rd International congress, 1920 by Otto Rühle
Article on the Third International from the Encyclopædia Britannica

Communist International

Background

Foundation and early years (1919–1923)

First (Founding) Congress

Universalisation of Bolshevism

"United workers' front"

Bolshevisation and Stalin's rise (1924–1928)

Impact of Soviet inner-party struggles

Organization

Member parties

Sponsored organizations

Bureaus and training schools

Historiography

Legacy

See also

References

Works cited

Further reading

Historiography

Primary sources

External links