I saw this in the humanities and social studies departments. I thought it was a conspiracy from the KGB. I have a friend who worked for the KGB and he thought the KGB did not have the resources to cause the kind of social upheaval we saw in the 1960’s. But to infiltrate the universities he might agree. Look at Bezmenov’s ytube. Something caused these departments of universities to turn hard left.
Though I did not take the classes, in those subjects, when I was at Polytechnic in NY, I saw the texts they were teaching in the English and humanities departments. Pure straightforward Marxism. This was a place dedicated to STEM so that was a surprise to me.