Explanation

Joseph Stalin was the leader of the Soviet Union during World War II.

He held power from the mid-1920s until he died in 1953.

Additional information:

World War II or the Second World War, was a global war that started from 1939 

The Little Boy type of bomb, was dropped on the Japanese city of Hiroshima on 6 August 1945 during World War II

The Fat Man was dropped on Nagasaki, Japan, on August 9, 1945, at 11:01 AM

the 2nd World War End on 1945