Political trials, formal and informal, against "class enemies" are typical of extremist left wing movements. See for example Maoist "struggle sessions", which seem nothing else than an in-person version of a twitter mob:

https://en.m.wikipedia.org/wiki/Struggle_session

Note that the targets of cancel culture are in the most proper sense "class enemies" since their sins are not directed against specific individuals but entire classes of people: blacks, women, transsexuals, etc.- and can be as vague as dismissive attitudes or generic antagonism.