Uh, no-as far as I'm aware, the Communists (even the rabid anti-semites like Stalin) didn't engineer a system for exterminating a whole race of people just because that race was called "Jewish."
Okay, now that's just lack of research. Refer to Regolith's post and do some reading. The Nazis were reprehensible, but they were nowhere close to the Soviets and pre-Soviets in number of manufactured deaths. No, they weren't all Jewish. Just insert any number of other ethnicities.
I don't understand this line of thinking. Something similar came up in a topic some months ago, and the left leaning members of the forum were practically defending Eurasian massacres as part of their talking points regarding Nazi atrocities.
Bridgewalker has put this in simple to understand terms: Murder bad. What I find reprehensible is people semi-defending Che because, "Hey, he only killed a few thousand people".
Stalin=bad
Hitler=bad
Guevara=bad
Murder=bad