Joseph Stalin (December 18, 1878 - March 5, 1953), also known as Josef Stalin, was a human who lived on Earth during the 19th and 20th centuries. Born Iosif Vissarionovich Dzhugashvili, Stalin would become involved in a power struggle that took place in the Soviet Union after the death of Vladimir Lenin. Stalin defeated a number of other figures in the 1917 revolution - including Leon Trotsky - and by 1928 was the ruler of the Soviet Union.
In the years prior to the Second World War, Stalin negotiated a non aggression pact with Nazi Germany. As war broke out in Europe, Stalin had the U.S.S.R. enter the war, fighting on the allied side. After the war, tensions increased between Stalin and other nation states on Earth - specifically the United States of America - leading to a sustained period of high tension which would later be called the Earth Cold War. By the time he died in 1953, Stalin had been responsible for the deaths of millions of his own people, and along with Adolf Hitler he would become one of the most hated humans in history.
Jean-Luc Picard often enjoyed running the Dixon Hill holodeck program - which was set in 1940s Earth. Once while running the program, the character of Madeline - who served as Hill's secretary - remarked that the last time they had a new case both Hitler and Stalin were still friendly towards each other. (TNG episode: "Manhunt")
Benjamin Sisko once experienced a vision sent to him by the Prophets in which he was a 1950s era science fiction writer. During the vision, publisher Douglas Pabst implied that writer Herbert Rossoff was a communist who had been angry ever since Stalin died. (DS9 episode: "Far Beyond the Stars")