Activities and affiliations

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1850–1919 ○ Natural causes

The great unifier of the Russian revolutionary movement, from the Chaikovtsy to the Left SRs

'I have complete discord with Lenin... I no longer believe in Lenin' — in 1919, on the eve of exile, breaking with the Bolsheviks after half a century of shared struggle.

Mark Natanson was a pivotal organizer who built the institutional backbone of the Russian revolutionary movement across half a century: co-founding the Circle of Tchaikovsky, Land and Liberty, and the People's Rights Party, and serving on the Central Committee of the Socialist Revolutionary Party. Known as the 'Ivan Kalita of the revolution' for his talent in unifying dispersed circles, he stood with Lenin as an internationalist at the Zimmerwald and Kienthal conferences during the First World War. In 1917 he led the formation of the Left SRs and later the Party of Revolutionary Communism, backing the Bolsheviks through the October Revolution, but grew disillusioned as the regime turned toward one-party dictatorship, leaving the words 'I no longer believe in Lenin' before fleeing into exile.

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1870–1908 ○ Pulmonary sarcoma

The 'Tiger of the Revolution' who founded the SR Combat Organization

Arrested in Kiev in May 1903, Gershuni did not resist — instead he kissed his handcuffs and leg irons before the watching gendarmes, a gesture that entered revolutionary legend.

A co-founder of the Socialist Revolutionary Party and the founder and first leader of its Combat Organization, he masterminded the political assassinations that shook the Russian Empire in 1902–1903, beginning with Interior Minister Sipyagin. Born to a Jewish family, he was a pharmacist and bacteriologist who ran cultural-enlightenment schools in Minsk before the limits of legal methods drove him to become a full-time revolutionary; as the 'Tiger of the Revolution' he became the Empire's most wanted man. Arrested in 1903 and sentenced to death, commuted to life at hard labor, he escaped the Akatuy katorga in 1906 hidden in a barrel of sauerkraut, traveling through China, Japan, and the United States to return to Europe, where he died before learning that his deputy and successor Yevno Azef was an Okhrana spy.

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1873–1952 → Exile

Founder and chief theoretician of the Socialist Revolutionary Party

18 January 1918, Tauride Palace. Elected Chairman, Chernov opened Russia's first — and last — democratically elected parliament. After Bolshevik deputies walked out, the Assembly passed the land socialization law. At 4:40 a.m., the armed guard approached: 'The guard is tired. Please close the session.' Chernov scheduled the next meeting and gavelled the session closed. It never reconvened.

He fused narodnik agrarianism with Marxism to make land socialization the PSR's core program, serving as its chief theoretician. Elected chairman of the Constituent Assembly in 1917; after the Bolsheviks dissolved it, he spent 32 years in exile answering with his pen.

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1878–1943 ○ Died

SR Party founder who chaired the last unified anti-Bolshevik government, overthrown by Kolchak

Trotsky called him 'the complete caricature of a statesman. A really charming teacher of language in a ladies' seminary in Oryol — that is really all you can say about him.'

A founder and right-wing leader of the Socialist Revolutionary Party, he led the SR faction in the 1905 St. Petersburg Soviet and served as Minister of the Interior and chairman of the Pre-Parliament in Kerensky's Provisional Government. During the Civil War, as the culmination of efforts to unite the anti-Bolshevik camp, he was elected chairman of the Provisional All-Russian Government (Ufa Directory) at the Ufa State Conference. Arrested and expelled by Kolchak's coup in November 1918, he continued émigré journalistic work in Paris and New York. His political trajectory encapsulates the collapse of democratic socialism in the Russian Revolution, crushed between armed extremes.

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1879–1925 ✕ Executed/Suspicious death

Terrorist, Counter-Revolutionary: the Black Horse of the Revolution

At his 1924 trial: 'I am Savinkov, of the Plehve and Grand Duke Sergei assassinations. All my life I worked for the people, yet now I am charged with bearing arms against the workers' and peasants' power.'

Revolutionary and novelist who led the SR Combat Organization, directing assassinations of high-ranking tsarist officials. His The Pale Horse (1909) novelized the psychology of terrorism. After the October Revolution he led anti-Bolshevik armed struggle, was arrested in an OGPU trap, and died at Lubyanka.

Political and party leadership Socialist Revolutionary Party (PSR/SR) 1882–1940 ○ Died in prison

SR Combat Organization veteran who chaired the first-convocation VTsIK in 1917

Arrested in 1907 and sentenced to eight years of katorga, he was settled in Usolye, Irkutsk province, where he joined the anti-war internationalist 'Siberian Zimmerwaldists.'

Born in Moscow into a Jewish tea-merchant family, he followed his elder brother Mikhail Gots into the Socialist Revolutionary Party and joined its Combat Organization in 1906. Arrested in 1907 and sentenced to eight years of katorga, he was settled in Usolye, Irkutsk province, in 1915. Back in Petrograd in 1917, he led the SR faction in the Petrograd Soviet and was elected chairman of the VTsIK at the First Congress of Soviets. Opposing the October Revolution, he led the Committee for Salvation of the Homeland and Revolution; at the 1922 SR trial he was the main defendant and received a death sentence, commuted in 1924, followed by exile to Ulyanovsk in 1925. Rearrested in 1937, he was sentenced to 25 years in 1939 and died in 1940 in a Krasnoyarsk labour camp.