The Communist USSR, from 1917 onwards killed millions of it's own people, through executions, deportation to Siberia, deliberate starvation of large numbers of the population with it's biggest mass murderer Stalin, easy on par with Hitler.
I once read there was mass panic amongst the Communists leadership, when Stalin was to visit a remote part of the USSR by train. The problem being Stalin had killed all the skilled track and train workers, as enemies of the State. So the train service was falling apart with no skilled workers to run it left alive, they despaired how they were going to get him there. knowing failure to do so could mean death for them and their families. I can't remember how they did get him there, but they manage to somehow.
So yes, easy on par with South Africa. If I remember correctly, the Communists in the USSR were not that keen on Jews, although there were Jews in the leadership. Many of the well known dissidents were Jewish.