Stalin
Joseph Vissarionovich Stalin (18 December 1878 – 5 March 1953) was a Soviet revolutionary and political leader of Georgian ethnicity. Governing the Soviet Union as its dictator from the mid-1920s until his death in 1953, he served as General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 to 1952 and as Premier of the Soviet Union from 1941 to 1953. Ideologically a Marxist and a Leninist, Stalin helped to formalise these ideas as Marxism–Leninism while his own policies became known as Stalinism. 
He executed and killed more people than nazi's did. Stalin was a living satan and may anyone tell me I am wrong, I'll spit on him/her with pleasure.