Stalin didn't Start WW2 his engagements had nothing to do with what Hitler did, try again! It was Hitlers expansion into the eastern block not the other way around.
As for comparing Antifa a made up boogie man to your horseshit comparisons of Communism both then and now being a threat if fucking laughable the closest the Communist ever came to being a threat and they weren't was during the red scare, in the goddamn 50's where the government like now full scale went after Communist or anybody with Communist ties.
White Supremacy has always been a problem for about a few hundred years in the States the Nazi party however is more recent, and active and have murdered and killed people in the U.S sure as shit since the 50's where Communist killed 0 on American Soil, and in terms to everywhere else.
After WW2 However the Soviet Union did set it's sites on Expansion which blew up in their faces, and Communism itself started it's long Trek to being fucking Irrelevant, until it simply collapsed on it's own.
You are making shit up, out of nothing you would be better off Comparing Antifa to the Jurassic Period and suggesting that T-Rex's were really a danger of fucking eating people.
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It's as legitimate as any of your flat out bullshit claims, let's face it, you are going to believe whatever the fuck you want despite the facts.