A Jewish friend from Romania told me that after the Czars and the Nazis, communism looked good. I think many have not moved on from this mindset.
That's because the Soviets pretty much kept their antisemitism (as well as just about all their other internal repressive policies) secret from the rest of the world until after WWII, when the ugly truth began to leak out slowly.
This Romanian Jew's feelings were, regrettably, fairly common among Jews, largely because the majority of the world's Jews lived in eastern Europe and most of those were czarist subjects in the late 19th and very early twentieth centuries. The majority of today's world Jewish population is descended from czarist subjects, and so leftism (originally a response to czarist persecution) has been handed down to many through several generations. Of course, many myths and historical lies arose as time passed, which facilitated the familial transmission of a dysfunctional leftist ideology from one generation to the next.