Or are you in agreement with these actions since they were in support of such a 'great cause'?
The left wing forgives Stalin because he was a leftist. Left wing genocide was and is ignored by leftist academics and media, so Americans were never worked up into a lather about it. But you are completely right if you say that Stalin was at least as bad and likely worse than Hitler.
Besides, Stalin was not as stupid as Hitler. He never took pictures.