Communism and NAZIsm are forms of Socialism. Socialism erodes individual liberties and autonomy.
NAZIs were nationalist socialists who incited racial strife.
Communists were internationalist socialists who incited class strife.
Modern progressives incite both.
You can’t have fascism without a huge overbearing state that micromanages every aspect of the lives of the governed. Socialism (in all its forms) is the perfect vehicle for fascism.
It’s a shame a lot of people refuse to see that. It’s all the Left. It’s all Collectivism. It’s all Tyranny. National Socialism, Fascism, Socialism, Communism — they all seek a powerful centralized government, they emphasize group rights for some lucky folks, but recognize no rights for individuals. At a fundamental level, it’s all the same. And the US Democrats are very much in that pot.