Vladimir Lenin was a revolutionary leader who played a pivotal role in 20th century Russian and world history. He was a Marxist theorist who led the Bolshevik Revolution in 1917, overthrowing the provisional government and establishing the Soviet Union. Lenin went on to become the first head of government of the USSR, instituting communist policies and greatly influencing leftist movements internationally through his ideology of Leninism before his death in 1924. His revolutionary actions and political philosophy transformed Russia and left a lasting impact that continues to shape global politics.