When, by contrast, a movement transgresses those limitations and starts to become effective in impeding the injustices it targets — particularly when preserving those injustices is valuable to the most powerful — that’s when it has to be stopped at all costs, including criminalizing it with the harshest possible legal weapons.

That the FBI spends serious effort on this and (as far as I understand) virtually none on white supremacists and MRAs just completely baffles me.