Depends on if you get caught and if the cops are around. If there isn’t police close by you probably can get away with it especially if you’re concealing your identity and nobody snitches on you.

You might also get shot doing it but that’s a risk you take brawling in the USA with fascist pigs.

Regardless of the circumstances and how morally correct the stance of punching or otherwise … eliminating … Nazis is the law is clear that this is illegal.