Now there is an organisation in the USA that has recently started to use the Antifa Branding. It's called Torch Network or https://en.wikipedia.org/wiki/Anti-Racist_Action but that one, too is not related to Germany 1931 or to Stalinism.
Same with Cultural Revolution in China or Khmer Rouge. Same with Nazi Germany - I seriously doubt Hans Sixpack hated Jews or Slavs all that much. In a way, Fascism was too "lifestyle branding". Germans, down and out after WW1, were sold this grand vision of Third Reich and Lebensraum stretching shore to shore on the Eurasian continent. Oh, and if you're against it, not only you'd get "canceled", you'd get shot by the nearest ditch. We're a few years out from that at the moment. In terms of tangibles outside lifestyle branding, BTW, Antifa at the time wasn't that different from fascists themselves. They wanted a communist authoritarianism, hammer and sickle and everything, while fascists wanted more of a capitalist version. Any sort of "democracy" wasn't even up for discussion.
Same with communism. Why wouldn't a "working class" Ivan Sixpack want to "own" the factory he works in? It did not occur to Ivan to think about what that'd actually mean in practice. 5 years later Ivan dies of starvation, 15 years later his extended family ends up dying in Gulag, for being "counterrevolutionary element". He did not end up improving his condition before he kicked the bucket either: the factory is now owned by the state, and it's illegal to not work there. Ivan was a useful idiot, and he outlived his usefulness. Don't be like Ivan.
> The FBI says antifa uses social media to organize, but there’s no specific organization or leadership structure.
To me it looks like a very loose group of "anti-parental-authority" youth on the left fringe, which mostly idiolises fantasy-feelgood-anarchism, mixed with some older anti-klan streams that are special to the USA. You can't just claim that is the continuation of the paramilitary wing of KPD 1931 halfway across the planet, then also claim it is basically Thälmanns KPD, which is basically Stalin himself, because all things loosely related are the same thing. I call bullshit.
Those far fetched stories about how revolutionaries have found themselves abused by some autocratic authoritarian putschists are nice and true, but they do not give any substance to your claim that current Antifa USA is a stalinist organization. Your argument seems to be "all leftist revolution must end in stalinism, therefor they are all stalinists", which is so ridiculous, there should be some Godwins law variant for that.
That democracy you speak of is based on the believe in pluralism, yet you deny the existence of pluralism in the vague field that spans from KPD and Antifa 1931 to todays USA. You somehow completely ignore the 1980s hardcore anarchistic punk scene, 90 years of history, and instead you throw in some "cancel culture" and "maoist culture revolution". You have nothing backing your claim that it is a stalinist organization except matching symbols on anti-capitalist merchandise sold for $5.99 and a generalized red scare.
Now i agree with you on warning about the dangers of totalitarian authoritarianism. On that part we are fine. But you are crying wolves because of a freaking chihuahua! Yes that thing is related to wolves, and it is annoying, but you are the idiot for thinking they are the same. Freedom and Liberalism are not attacked by some rioting teenagers in downtown Seattle. Those who make encryption illegal and want everything on the net monitored by the Ministry for State Security for signs of domestic terrorism, those are the wolves.
This is a wonderful theory, but the past couple of years (Centuries, in the case of racial equality) of political discourse in America has shown that it does not match reality.
There are plenty people who have no problem arguing for racism, or for fascism, and thanks to Twitter, Facebook, YouTube, Reddit, those people have gained both a lot more influence and a lot of, to put it charitably, allies of convenience - or, to put it uncharitably, true believers.