In the 1980s Stanley Rothman and Robert Lichter co-authored the “Roots of Radicalism: Jews, Christians and the New Left”.
They were liberal academics and this was a scholarly study of who exactly comprised the 1960s New Left radical movement; which I suppose now is the controlling influence in the Democratic Party.
Anyway the members were disproportionately Jews and Catholics, both groups having an affinity for radical politics. I can recall a good number of Protestant radicals running around in the 1960s as well but their proportion was smaller.
IIRC Rothman and Lichter were denounced as being evil “conservatives” which of course they weren’t, for simply having done the study.
I’m happy but you already knew that lol