I mean… it wasn’t.

Communism means all things held in common. Theft wouldn’t be a thing because everyone owns all property together. Ownership is meaningless.

Every one of those societies only paid lip service to communism - partly because it only works when everyone in the commune knows everyone else and holds each other responsible. It doesn’t work at scale. What those societies really were was “The state owns everything and if you complain about it you get disappeared.”