Communism is a word commonly thrown around a lot by Capitalists as if they're not destroying the entire world as we speak. The thing is , Capitalism has no moral highground in comparison to the same regimes they use as an example of immoral economic systems. I mean, c'mon you used North Korea as an example. Of course someone as unstable as Kim Jung Un and the gang would take something that was meant to be a solution and apply it in a totalitarian way. All While Capitalist America is pokes Kim with a stick. I could literally give you a million reasons why you are wrong. Unfortunately it would take too long.
Your second example was Venezuela. Which lacks the resources,technology, and infrastructure to maintain such a system without backlash. I bet if they had a lot more oil they would prosper. Also if you read up on Venezuela you'll find that their prices are dictated by who?????? Some guy in Alabama. Oh let me rephrase that.... A CAPITALIST IN ALABAMA. Even still I don't see them pointing nukes like Kim. Your whole perspective on Bernie Sanders is also invalid.