Joseph Stalin (1878-1953) was the dictator of the Union of Soviet Socialist Republics (USSR) from 1929 to 1953. Under Stalin, the Soviet Union was transformed from a peasant society into an industrial and military superpower. However, he ruled by terror, and millions of his own citizens died during his brutal reign. Born into poverty, Stalin became involved in revolutionary politics, as well as criminal activities, as a young man. After Bolshevik leader Vladimir Lenin (1870-1924) died, Stalin outmaneuvered his rivals for control of the party. Once in power, he collectivized farming and had potential enemies executed or sent to forced labor camps. Stalin aligned with the United States and Britain in World War II (1939-1945) but afterward engaged in an increasingly tense relationship with the West known as the Cold War (1946-1991). After his death, the Soviets initiated a de-Stalinization process.