[ShinyLeftPad]

You would be wrong. The people you described were called "тунеядцы" in USSR. With a possible exception of bureaucrats who existed as a result of centralized government but were also called "a barrier for the working class" by Lenin etc.

I also highly doubt USSR would accommodate people who move in and don't bother to integrate into the culture and speak Russian. Ask people from entire countries where Moscow did Russification, and those people didn't even move in from outside they already lived there.