I think they often end up in prominent positions because they work hard. White leftists (at least the college types) don't, or at least aren't as smart about choosing degrees. Jews pressure their kids to be doctors and lawyers, like Asians. So they'll always end up being the intellectual leadership of the left, but other races tend to comprise the political leadership and boots on the ground. That's my theory anyway. I feel like destructive leftist ideologies frequently come from Jewish writers for that reason, but the people who actually carry out those ideologies are white or some other race. Same thing with the Bolsheviks, Marx came up with the ideas, but when the Reds finally acted they also persecuted Jews for being too borgeois.

It's true though, that most Jews in America at least, are leftists. I think you can criticize Jews as a group for other things, too, like any group. I don't know if it's true or not, for instance, but if Italians, Irish, and Russians all have mafias, then you can have a "world Jewry" mob that causes trouble and pulls strings. If you're deciding all Jews are evil and need to be wiped out because of that, though, you need to go outside or something.