Further back than that. It started with the SDS, STUDENTS FOR S DEMOCRATIC SOCIETY. it was a very left leaning organization. Look it up.
https://en.wikipedia.org/wiki/Students_for_a_Democratic_Society
Started with John Dewey. Don’t get me started on Dr. Spock.
This was the first of the signs and symptoms appearing. The infection was several generations before that.
Bill Ayers didn’t get to his level of influence without help from his mentors.