First of all, they are not Nazis. They are communists.
Nazis send communists to Dachau or hang them with piano wire. They don't send them summonses and provide them with lawyers. Why do you suppose the Left is so paranoid about "Nazis"?
Second of all, this communist shock army is doing the bidding of the Feds. They are protected by the police and by the courts. And their intimidation tactics are working.
Why on earth would the Feds lock them up?
They’re each both Nazi and communist.
1. We Americans see both as being the same thing as far as we’re concerned. That’s the most important reason. Both are foreign-minded trash desiring tyrannical government. One is as bad as the other.
2. Both Nazis and commies were hard socialists.
3. The Antifa criminals would like to have the government own all businesses, land, etc. (commies), but they’re willing to settle for the government controlling all of the resources for a while (Nazis).