The number of cases is legion. But here are six cases where people were arrested, prosecuted or sued that ultimately were overturned by the Supreme Court:
Discover six of the U.S. Supreme Court's landmark cases on hate speech and the First Amendment since World War II.
www.thoughtco.com
I am not condoning what happened in any of these or any similar cases. In fact I would be vocal criticizing or condemning these kinds of things. But SCOTUS was correct that the people doing them have the constitutional right to do so.
In effect the high court has been consistent in refusing to uphold 'hate speech' as a prosecutable offense unless there is material or bodily harm to an offended party.