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.

Military command Party of Left Socialist Revolutionaries 1880–1918 ✕ Killed during rebellion

Tsarist officer turned Red commander who took Kyiv, battled in Bessarabia, and rebelled against Brest-Litovsk

After taking Kyiv he reported to Lenin: 'I ordered artillery to strike at high-rise and rich palaces, at churches and priests.'

A peasant-born officer of the Imperial Russian Army who distinguished himself in the Russo-Japanese War and World War I, he joined the Left SRs in 1917 and commanded the defense of Petrograd during the October Revolution. In early 1918 he seized Kyiv, establishing Soviet power in Ukraine, then led operations on the Romanian front to defend Bessarabia. Appointed commander of the Eastern Front in June 1918, he rebelled against the Brest-Litovsk Treaty in July, declared a 'war against Germany,' and was killed in Simbirsk.

Political and party leadership Party of Left Socialist Revolutionaries 1884–1941 ✕ Executed

Face of the Left SR Party and peasant tribune: the last revolutionary opposition leader to challenge the Bolsheviks from the left

"I undertook this sentence because my heart was tearing from pain... it was shameful and hard to live, hearing what was happening in the villages after Luzhenovsky." — Trial statement, 1906

A leading woman revolutionary of the Russian movement. Born in Tambov into a non-hereditary noble family, she left gymnasium in 1902 before joining the SRs. In 1906 she assassinated Tambov official Luzhenovsky over his suppression of peasants and became a national hero; her death sentence was commuted to lifetime hard labor at Nerchinsk. Freed by the February Revolution, she became a leader of the Left SR Party and chaired the All-Russian Peasant Congresses, and was nominated for Chair of the Constituent Assembly with Bolshevik support (153 votes to Chernov's 244). She broke with the Bolsheviks in 1918 and joined the Left SR uprising, then endured decades of arrest and exile. Rearrested in Ufa in 1937, she was sentenced to 25 years and shot near Oryol on 11 September 1941; Russian sources record 157 political prisoners executed there.

Political and party leadership Party of Left Socialist Revolutionaries 1885–1938 ✕ Executed

Co-founder and chief theoretician of the Left SR Party: from coalition with the Bolsheviks to the July 1918 uprising

"We, as political actors, at a moment when an event of immense historical significance is taking place, could least of all occupy ourselves with moral characterization. It was clear to us that our place was with the revolution." — First PLSR Congress, November 1917

Co-founder and chief theoretician of the Left SR Party. Entered coalition with the Bolsheviks, then led the July 1918 uprising against the Brest-Litovsk Treaty. After its suppression he endured repeated exile and was executed in 1938.

Political and party leadership Party of Left Socialist Revolutionaries 1888–1957 ○ Natural causes

First People's Commissar of Justice under Lenin: the Left SR who defended revolutionary legality against the Cheka

"Then why bother with a Commissariat for Justice? Let's call it frankly the Commissariat for Social Extermination!" — to Lenin, protesting a Cheka summary-execution clause, February 1918

Left SR lawyer, first People's Commissar of Justice in Lenin's coalition government. He championed revolutionary legality against the Cheka and resigned over the Brest-Litovsk Treaty. In exile he was a Yiddish writer and territorialist activist.