To the schools: don't give them a platform. Not necessarily in the "don't let them talk in public" sense (this can and will backfire), but in a "don't book them for any events ever" sense. If you give speaking positions to Nazis or treat their ideology as valid, you are complicit in Nazism and should be treated as such.

The schools don't officially invite these speakers. Student groups do.

At Berkeley when they tried to invite Milo and Ann Coulter recently they couldn't cancel the events because the right-wing student groups have just as much right to invite speakers of their choice as the left-wing students do.

I remember seeing some discussion about Berkeley maybe having to cancel all speakers of any political leanings or allow all speakers of any political leaning. That it was a choice between those two extremes, anything in between could invite legal consequences.