People of the Revolution and the USSR

Non-Bolshevik socialists 1825–1864 ✕ Shot in a duel

Founder of the ADAV, Germany's first workers' party

"Das eiserne und grausame Gesetz" — the iron and cruel law Lassalle said held wages down to bare subsistence (1863)

A lawyer and agitator from a Jewish merchant family in Breslau. In May 1863 he founded the General German Workers' Association (ADAV) at Leipzig and was elected its president for five years, arguing that universal suffrage would turn the state toward funding producers' co-operatives and so toward socialism. That same year he met Bismarck in secret to sound out an alliance between the workers and the Prussian monarchy, which drew Marx's deep suspicion. In 1864 he was shot in a duel over a marriage and died three days later outside Geneva. Eleven years afterwards his programme supplied the frame of the Gotha unity programme.

Russian Social Democratic Labour Party (RSDLP) Non-Bolshevik socialists 1849–1919 ○ Natural causes

From a narodnik revolver to Marxist criticism, half a century of one woman's revolutionary life

On 31 March 1878, the jury returned a unanimous acquittal. The crowd lifted Zasulich onto their shoulders and marched through the streets of St. Petersburg. The tsarist government ordered her rearrest at once, but the shot she had fired already echoed across Europe.

In 1878 she shot St. Petersburg governor Trepov, and a jury acquitted her. That single shot detonated public fury against tsarist autocracy, and all Europe learned her name. Yet Zasulich was the first to grasp that terror was a dead end, and turned to Marxism. In 1883 she co-founded the Emancipation of Labour group (Russia's first Marxist organisation) with Plekhanov and Axelrod. She served on the Iskra editorial board, represented Russia at three congresses of the Second International, and became one of Russia's earliest Marxist literary critics. A Menshevik, she opposed the October Revolution of 1917 and died of pneumonia under Bolshevik rule.

Social Democratic Party of Germany (SPD) Non-Bolshevik socialists 1850–1932 ○ Natural causes

Founder of Marxist revisionism and evolutionary socialism, author of The Preconditions of Socialism

"I have extraordinarily little interest in what is called the 'final goal of Socialism.' This aim, whatever it be, is nothing to me, the movement everything." — Response to critics (1899)

German SPD theorist and politician. Engels's literary executor and editor of Der Sozialdemokrat, Bernstein began as an orthodox Marxist before his 1899 The Preconditions of Socialism challenged Marx's predictions of capitalist collapse, class polarization, and revolutionary necessity. His dictum "the goal is nothing, the movement everything" laid the foundation for social democracy's reformist, parliamentary turn, creating the schism between revolutionary socialism and evolutionary social democracy. He broke with the SPD's pro-war majority to co-found the anti-war USPD during World War I, and spent his final years defending Weimar parliamentary democracy, dying six weeks before Hitler took power.

Independent Social Democratic Party of Germany (USPD) Non-Bolshevik socialists 1854–1938 ○ Natural causes

Chief theoretician of orthodox Marxism in the Second International, founding editor of Die Neue Zeit, editor of Marx's Capital Vol. IV

"Socialism as a means to the emancipation of the proletariat, without democracy, is unthinkable." — The Dictatorship of the Proletariat (1918)

Leading Marxist theoretician of the Second International. He authored the Erfurt Programme, refuted Bernstein's revisionism, and after the Russian Revolution critiqued Bolshevik rule, creating the defining point of divergence between social democracy and Leninism.

Russian Social Democratic Labour Party (RSDLP) Non-Bolshevik socialists 1855–1941 ○ Died

Co-founder of the Emancipation of Labour group and a Menshevik pioneer at the origins of Russian Marxism

'Had I announced myself a follower of the prophet Mohammed, they could scarcely have been more surprised' — fellow prisoners on learning he had become a Marxist.

A former Narodnik and member of Black Repartition, in 1883 he co-founded the Emancipation of Labour group in Switzerland with Georgi Plekhanov and Vera Zasulich, Russia's first Marxist organization. As the group's chief organizer, he ran its clandestine printing and smuggling network until his arrest in Germany in 1884 and extradition to Russia, where he served thirteen years of katorga at Kara. After a dramatic escape in 1901, he joined the editorial board of Iskra and at the RSDLP's Second Congress aligned with the Mensheviks, helping shape the party's formative split; his memoir Half a Century (За полвека) remains a primary source on the Russian revolutionary movement.

Russian Social Democratic Labour Party (RSDLP) Non-Bolshevik socialists 1856–1918 ○ Natural causes

The father of Russian Marxism: against his own pupils’ revolution

After the October 1917 seizure of power, Plekhanov said: "Russian history has not yet ground the flour from which the wheat pie of socialism will be baked."

He began as a Populist and transplanted Marxism into Russia: Lenin’s whole generation learned from his books. But returning in 1917 after thirty-seven years abroad, he condemned the October rising as premature, a violation of history’s stages. He died of tuberculosis under the regime his pupils had built, and his funeral became a half-opposition demonstration.

Social Democratic Party of Germany (SPD) Non-Bolshevik socialists 1867–1924 ○ Heart attack

Co-author of permanent revolution who arranged Lenin's sealed train: the 'merchant of revolution'

In December 1917, Lenin refused Parvus's request to return to Russia with the words: 'the cause of the revolution should not be touched by dirty hands.'

A Marxist theorist and journalist in the German SPD who co-developed the theory of permanent revolution with Leon Trotsky in 1904–1905. During World War I, he built a revolutionary network inside Russia with German government funding and played the decisive role in arranging Lenin's return via the 'sealed train' in April 1917. After the Bolsheviks took power, Lenin refused his request to return, declaring that 'the cause of the revolution should not be touched by dirty hands'; Parvus remained in Germany and became an advisor to early Weimar Republic leaders. Criticized for commodifying his principles between revolutionary Marxism and realpolitik, he remains one of the most controversial figures of 20th-century socialism.

Non-Bolshevik socialists 1869–1947 ○ Natural causes

A historian who linked scholarship with social democracy

In Moscow in 1940, he signed the peace treaty that ended the Winter War.

Väinö Voionmaa was a Finnish historian, professor and Social Democratic politician who helped shape the early republic. He founded institutions for workers’ education and joined scholarship to popular political work through parliament, diplomacy and social policy. As a Social Democratic member of Finland’s delegation to the Moscow Peace Treaty negotiations in 1940, he signed the settlement that ended the Winter War, embodying the difficult compromises imposed on Finland between war and great-power politics.

Non-Bolshevik socialists 1871–1944 ○ Died

The Marxist economist who became a priest and built the theological system of Sophia

At the funeral of his four-year-old son Ivan in 1909, Bulgakov recorded: 'I understood what "God spoke" means' — a mystical experience he regarded as the final step in his return to Orthodoxy.

A Russian Orthodox theologian and economist whose trajectory from legal Marxist to ordained priest traced the defining intellectual pilgrimage of 20th-century Russia. Gaining recognition in the 1890s for Marxist economic writings, he discovered the limits of Marx's theory in his two-volume Capitalism and Agriculture (1900) and, passing through Kant and Vladimir Solovyov's philosophy, returned to the Orthodox Church. His landmark Vekhi essay 'Heroism and Asceticism' (1909) indicted the intelligentsia's atheistic revolutionism; exiled on the 'Philosophers' Ship' in 1922, he co-founded the St. Sergius Orthodox Theological Institute in Paris and completed his sophiological theological system.

Socialist Revolutionary Party (PSR/SR) Non-Bolshevik socialists 1889–1968 ○ Natural causes

SR leader imprisoned by both Tsar and Bolsheviks, who became founder of Harvard's sociology department

In an open letter written from the Cheka basement in Veliky Ustyug in 1918 while awaiting execution, Sorokin renounced his SR party membership and declared an end to his political activity.

A leading figure in the Socialist Revolutionary Party (SR) during the Russian Revolution, Sorokin served as secretary to Prime Minister Kerensky and was elected to the Constituent Assembly. Imprisoned three times by the Tsarist regime, he was sentenced to death by the Bolsheviks after 1917 and exiled in 1922 on the 'philosophers' ship.' In the United States he founded Harvard's department of sociology in 1930, becoming one of the 20th century's most important sociologists through his work on social stratification, social mobility, and the cyclical theory of sociocultural dynamics in his magnum opus Social and Cultural Dynamics.

Non-Bolshevik socialists 1892–1982 ○ Natural causes

Author of the 14-volume History of Soviet Russia; diagnosed a "latent incompatibility" between NEP markets and planning

'There was a latent incompatibility between the principles of the New Economic Policy and the principles of planning.' From Foundations of a Planned Economy (1969).

A British historian and former diplomat, he authored the 14-volume A History of Soviet Russia (1950–1978), a comprehensive account of Soviet political, economic, and social life from 1917 to 1929. In international relations, The Twenty Years' Crisis (1939) helped lay the foundations of classical realism, while What Is History? (1961) redefined the historian's craft as interpretation rather than the accumulation of facts. On the NEP, he judged that there was 'a latent incompatibility between the principles of the New Economic Policy and the principles of planning,' an assessment that became one of four major historiographical positions on the policy's viability. He remained a fellow of Trinity College, Cambridge, until his death.

Labour Party (United Kingdom) Non-Bolshevik socialists 1930–2019 ○ Natural causes

Harvard sinologist whose Origins of the Cultural Revolution trilogy and Mao’s Last Revolution dissected China’s elite politics

A journalist in London through 1961 who covered Chinese developments from afar, he first reached mainland China only in 1972; he went on to study elite Chinese politics from the founding of the People's Republic through the Cultural Revolution.

A Briton born in India, he was a journalist and a Labour MP before becoming a scholar, and founded and edited The China Quarterly. The three volumes of The Origins of the Cultural Revolution (1974–1997) traced the line struggles inside the top leadership from the Hundred Flowers of 1956 to 1966, showing the Cultural Revolution as the outcome of political conflicts accumulated since the failure of the Great Leap rather than a personal whim of Mao. Mao’s Last Revolution (2006, with Michael Schoenhals) is the standard narrative of 1966–1976. He was a professor at Harvard and director of its Fairbank Center.

Non-Bolshevik socialists 1939–

American sociologist who reopened the debate on the Cuban Revolution

In The Origins of the Cuban Revolution Reconsidered (2006) he cast the revolutionary leaders as autonomous actors pursuing their own ideological vision rather than a master plan, challenging the dominant reading.

Born in Marianao, Cuba, to Jewish immigrant parents from Poland. He joined the anti-Batista movement as a high school student, moved to the United States in 1958 and took his PhD in sociology at UC Berkeley in 1969. He taught at UCLA, SUNY-Old Westbury, Fairleigh Dickinson and Brooklyn College (CUNY), retiring in 2007, and has written on the Cuban Revolution, the Castro government, Soviet history and US politics from a left-wing, radical-democratic standpoint. No death record is confirmed.