Lev Davidovich Bronstein (7 November [O.S. 26 October] 1879 – 21 August 1940), better known as Leon Trotsky, was a Russian revolutionary, Soviet politician, and Marxist theorist. He was a central figure in the 1905 Revolution, October Revolution, Russian Civil War, and establishment of the Soviet Union. Trotsky, with Vladimir Lenin, was widely considered one of the two most prominent Soviet figures and was de facto second-in-command during the early years of the Russian Soviet Republic. Ideologically a Marxist and a Leninist, his thought and writings inspired a school of Marxism known as Trotskyism.

Born into a wealthy Jewish family in Ukraine, then part of the Russian Empire, Trotsky joined the Russian Social Democratic Labour Party in 1898. He was arrested for revolutionary activities and exiled to Siberia, but in 1902 escaped to London, where he met Lenin and wrote for the party's newspaper Iskra. Trotsky initially sided with Julius Martov's Mensheviks against Lenin's Bolsheviks after the party's 1903 schism, but declared himself non-factional in 1904. During the failed 1905 Revolution, Trotsky returned to Russia and was elected chairman of the Saint Petersburg Soviet. He was again exiled to Siberia, but escaped in 1907 and spent time in London, Vienna, Switzerland, Paris, and New York. After the February Revolution of 1917 overthrew the tsar, Trotsky returned to Russia and joined the Bolsheviks. As chairman of the Petrograd Soviet, he played an important role in the October Revolution that overthrew the Provisional Government.

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