It is a well known fact that many people from the soviet bloc fled to the west to escape communism, and that during the entire soviet time frame, from the beginning of the Russian civil war in 1918 until the last years of communism in 1990.
While it's true communism was a terrible thing, capitalism wasn't exactly free of problems either, and because of intense soviet propaganda, it could be tempting for low-class workers and/or unemployed people to flee to the soviet bloc in order to have a guaranteed job, especially after the death of Stalin when the situation of the soviet block was much improved.
Did people flee in this direction, too ?
People that would not count are :
- People spying for any western government
- People who originate from a soviet block country returning back home
- People moving there temporary for any non politically motivated reason (scientific research, humanitarian, etc...) - if they do so permanently then it counts, as we cannot know if there was a political reason behind that or not.