“Hardcore History” is a fantastic history podcast, by the way. Dan’s podcasts are in-depth and he has an excellent presentation style.
Check out John of Leyden (Anabaptists sect) who formed a communist totalitarian take over of Munster in the 1500s.
Brutal short rule and a very brutal ending to their rule. At least until recently you could still see the suspended cages (way up on the church) where the leaders remains had been displayed.
There is even a 19h century grand opera (G. Meyerbeer, Le prophète (The Prophet)) about the “utopia” (minus the brutal executions and the cages).