Yeah, but for years communists were sought out and jailed for having "un-american" ideas.
Nazi now has more than one meaning. There are Nazi traditionalists, who believe in the supirior race - blonde, blue eyed Christians. There are Neo-Nazis, who believe in the supiriority of the white "race" but are not like the traditionalists, as they see blacks as a bigger problem than Jews. Then there are people who seek to control others, who are simply "Nazis," in more of a slang-used way.