The Yalta Attendee was Joseph Stalin, a Soviet politician who served as the General Secretary of the Communist Party of the Soviet Union from 1922 to 1953. He was one of the most influential figures of the 20th century and was responsible for leading the Soviet Union through World War II and into the Cold War. He attended the Yalta Conference in 1945, which was a meeting between the leaders of the United States, the United Kingdom, and the Soviet Union to discuss the post-war reorganization of Europe and Asia.