Who were the two communist leaders of the USSR in the Early 1900s?

The two prominent communist leaders of the USSR in the early 1900s were Vladimir Lenin and Joseph Stalin. Lenin, the leader of the Bolshevik Party, played a crucial role in the October Revolution of 1917 and established the Soviet state. After Lenin's death in 1924, Stalin gradually rose to power, ultimately becoming the leader of the Soviet Union and implementing significant political and economic changes.