Does anyone have evidence that "left-wing anti-Semitism" is actually a thing?

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The early German social democrats were aware of it: they referred to the phenomenon as the "socialism of fools". In essence, it's blaming the excesses of capitalism not on mysterious, intangible forces like the accumulation of capital, but on an identifiable "other": the Jews (or euphamstically the International Jewry). It often has flared up since, often without even the excuse of Israel. One infamous example is that of Stalin in his later years, who became obsessed with a supposedly Jewish agenda to kill him (worth noting that a lot of the Bolsheviks that were killed in the Purges were Jews).

I dont think most anti semitism comes across from the Left (the right, most notably the current incumbent of the White House, are also just as likely to play that card), but given as the Left defines as anti-racist we have extra responsibility to rid our movements of the taint of AS.

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Perhaps a more interesting question: do people here consider Karl Marx's "On the Jewish
Question" an Anti-Semitic work? I've seen people argue both ways.