Infiltrated?
I was a DJ at my college radio station in '71 and '72. I distinctly remember having them on the list of PSA's on a regular basis.
"and meeting Wednesday at 2:00 in room 200 of the old library is SDS, all interested parties are invited to attend...."
infiltration was not mandatory by any means.
Well, I gotta tell you. I looked at it as infiltration and I still do. They came on to peaceful campuses and jazzed all the students up with propaganda and anti-war rhetoric.