Who led the Soviet Union during World War II?

Joseph Stalin led the Soviet Union during World War II, playing a crucial role in the Allied victory over the Axis powers. His leadership was marked by significant military strategies and the mobilization of the Soviet economy for war production. Under Stalin's command, the Red Army repelled the German invasion, particularly during pivotal battles such as the Battle of Stalingrad, which turned the tide in favor of the Allies. Stalin's policies and decisions during this time, including forming alliances with Western nations, were instrumental in shaping the post-war world. His leadership is often characterized by a combination of ruthless governance and decisive military leadership, which ultimately helped the Soviet Union emerge as a superpower after the war.