Well, one commonality all of these have is their Leninist variants of Marxism which contains some aspects that scream authoritarian hierarchies. That isn't to say that if a Classical/Neo-Classical Marxist regime ever did manage to come to power it would manage to avoid the authoritarian/totalitarian trap, just that we don't have the data for it. One might argue that without the sort of leadership organization the Leninist model adds it becomes impossible for a Classical/Neo-Classical Marxist group to take power, making it something of a moot question.