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Lev Davidovich Bronstein (7 November 1879 – 21 August 1940), more commonly known under his alias Leon Trotsky, was a Russian revolutionary, political theorist, and writer. He is known for his role in the October revolution of 1917, as well as his subsequent founding of the Fourth International. After Lenin's death, Stalin took control of the party and had Trotsky exiled from the Soviet Union in 1929. In 1940, Trotsky was assassinated by an NKVD agent in his home in Mexico City. Trotsky was the founder of the movement known as Trotskyism.