Many on the progressive or even classic left are indeed strongly anti Semitic due to their support for Palestine and the Arabs against Israel. Much of this is based in very valid arguments against Isreali government policies, but it can easily veer into the downright visceral against jews in that region. It's not just a fascist idea.
Fully agreed, which is why I specifically mentioned that there are valid criticisms and people who use those as a springboard for actual anti-semitism.
I only mentioned what I've witnessed. To say "Many on the progressive or even classic left" is hyperbole. Consider using a specific example instead of hearsay. You don't want people thinking you're a disingenuous shill, do you?