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As one example there's the Hunger Plan. Hitler's defeat stopped him from executing it, though they had started. He planned to kill 35-41 million people in eastern europe via starvation and take the land for Germany.
The USSR equivalent, Holomodor, killed 3-5 million, and was fully executed. Horrendous. Not as bad as the hunger plan.
And that was not the only Nazi mass death plan....
Maybe the Nazis were worse, but wasn't really a good vs evil war.