Born near Tiflis, Georgia, Stalin was expelled from priest training for radical Marxist ideas.
After joining the Bolsheviks, he was sent to Siberia in 1904 and played a minor role in the October Revolution.
As General Secretary, he seized power after Lenin’s death, expelling and exiling Trotsky.
Stalin's policies included collectivization and purges to eliminate opposition.
In 1939, Stalin signed a non-aggression pact with Nazi Germany, but in 1941, Germany invaded the Soviet Union. Stalin joined the Allies to defeat Germany.