This is why I posted the definition of Communism by Wikipedia. It does not say that subjects must stay or die.
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.
not a defining part of communism,
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.