Forget the "doper" part for a second, which didn't come into the picture until the ultraleft got into the "social revolution" of the 60s. That certainly wasn't predominantly Jewish, although Jewish youth participated in disproportional percentages.
There were a few "Red Diaper Babies" in just about every Jewish community in the late 40s and 50s, although they were a distinct minority within a minority.. The large majority of American Jews during that period were distinctly patriotic and anti-Soviet, and many fought the Reds successfully for control of Jewish and predominantly Jewish institutions, e.g., unions.
So you are overestimating the percentage of (nominally) Jewish Commies during the post-WWII era.
I don't think so...
When I look at the makeup of the ACLU, the most leftist organizations in the U.S. -- such as Code Pink, MoveOn.com, KOS, etc, etc, etc......, the lunatic Leftist wing of the Democrat party, Hollywood, Radical Environmental groups, Teacher's unions and Civil Service -- together with their most prolific and enabling donors -- I see a grossly disproportionate ratio of Jewish members in these groups whick I see as simply "useful idiots" serving the agenda of the Communists and other enemies of the Republic.
It’s like a family name, it gets handed down and its hard to change. My grandmother and grandfather were fervent Democrats, but they grew up in the great depression and fell for the New Deal. My Grandfather was a career Air Force officer and my mom an Air Force BRAT. He went on leave with my grandma to a Florida hotel that had a sign “No Blacks, No Jews, No Dogs”. He was in uniform so they didn’t really question him and his name wasn’t particularly or obviously Jewish.
Anyway, those kinds of stories have been told around Jewish dinner tables for generations. So the idea of “social justice” comes from hearing those stories. I don’t think it truly means marxism I think it means one thing to the New Deal generation and quite another to the boomers and possibly something else to Gen X and Y. (if gen X and Y even stand for anything that’s real... open to debate).
Anyway, I grew up in a liberal democrat home, and I went to a liberal democrat school, but I knew it wasn’t right. But they did teach me that totalitarianism was the biggest evil of the 20th century (and on that they were right). So 1+1=2 I instantly became an anti-federalist, anti-statist. Big government = bad evil government. Civics class taught me that the GOP was the party of the small government and local control, so when I turned 18 as a senior in High School, there was no question in my mind I would join the GOP despite that my entire family were democrats.
Sadly, I have discovered that the GOP has not really been the party they told me it was in civics class.