I think I agree that is does not scale well but can work really well in certain circumstances.
I also agree with everyone here, that people should be allowed to leave if it doesn't suit them.
This is why I posted the definition of Communism by Wikipedia. It does not say that subjects must stay or die. Some societies have CERTAINLY implemented that rule, punishable by death and I think it is terrible.
However, I think it is important to note, that to force it on people as such is not a defining part of communism, even though we see that a lot!
The problem today is that there often is no place to leave to. The world is covered and owned. Furthermore those advocating for communism ultimately want the entire planet that way. For the outside agencies still interact and do the same "evils" they are fighting.
ever read Marx where it started? It actually is. Wikipedia was likely written by someone who wanted you to think that. Yet in reality the movement advocates a lot of force.