PBS
Pbs: Red Flag
Read two eyewitness accounts of life under Stalin. They explain how Communism became "an all-consuming, all-explaining ideology that appealed to their deepest hopes and dreams."
Library of Congress
Loc: Revelations From the Russian Archives: Wwii: Alliance
This site from the Library of Congress discusses the alliance between the Allies and the USSR after Germany chose to break an agreement and invade Soviet Union. Links to primary source documents are included.