Communist Eastern European movie channels on Youtube (or other places)

Soviet Union and its satellite states didn't join the international copyrights convention until their collapse in 1989-1991. What does that mean? That means you can enjoy all of their high-(and low-, some are, and some people think they all are) quality movies produced during nearly 40 years time freely and legally. Of course there is one precondition: you need to get the movie copies first in one way or another so that you can watch (and you need to be able to understand their language, I guess. Nobody is kindly enough to making English subtitles of all those films). So let's take a look at how we can watch these artistic gems online.