First, Marxists, and we're talking Karl Marx aren't anything like Nazis. If you've read any of Marx, he would not have been happy with any of the nations that held up his name.
Who does Antifa hold up as whom they want to mimic? The Nazis hold up Hitler. Does Antifa, celebrate the actions of Mao, Stalin, Minh, Castro? Show me such. Fascism and Socialism/Communism are umbrella terms for ideologies. Nazism is a subset of Fascism (the Spanish weren't Nazis). A very specific murderous subset. I can think of no "good" nation that has taken elements unique to Nazism, and implemented the into their system. Can you? Conversely, I can think of numerous nations that to some degree have communist or socialist leanings, and aren't murderous. You're comparing apple to oranges, until you can specifically point out the ideologies that antifa adheres that are comparable to Nazism. I have yet, not seen any.
Yes. Antifa upholds the values of those murders, just like today's Nazis do theirs. You're making it easier and easier to wonder if you're rationalizing away the deeds of an organization every bit as dangerous as Nazis.
Nazi was a political party. CPSU was too. So the **** what? Two sides of the same coin. They both murdered millions of people. There is no way a non-ideologue can rationalize that one is any more favorable or less aberrant than the other. They're BOTH fascists. Stop favoring the fascists in your tribe.