Anytime someone on reddit mentions communism, they immediately say that China, Russia, etc weren't communist countries and that true communism has been successful in many smaller communities.
Are there any communities/communes that have followed "true" (marxist?) communism that grew and thrived for multiple generations without incorporating capitalist principles?
You may be interested in revolutionary Spain. The Marinaleda village can be considered as a good example of what a communist community may look like too. Just google for it.
I am aware this comment is very far from AskReddit standards but it can serve as a starter until someone with a better answer come.