What did Joseph Stalin do to end nazism?

Stalin did many things to contribute to the war effort against the Nazis. His economic policies and military tactics were far better than those of the nazis. Soviet losses in WW2 were far, far higher than those of any other nation. Not only was Stalin instrumental in defeating the Germans, but he also pursued a policy of dominating postwar Eastern Europe. He replaced one tyrany with another. Having said that, the sacrifices made by the Soviet Union in WW2 were far greater than in any other theatre of the war.