I've been listening to The Dawn of Everything, a New History of Humanity the past couple weeks and it's been quite interesting. Particularly relevant to this topic is how many societies we have evidence for — through actual contact and documentation or through archaeological findings and anthropological research — that either consciously did not develop or later abolished a ruling class, whether as devolved cultural groups or even in cities of tens of thousands. Examples are given for cities in Mesopotamia, Yucatan, iirc north of the Black Sea, and other areas.

Lots of interesting stuff on personal freedom, collective decision-making, community care, agriculture and conscious lack thereof, etc.