We used to have a couple come out to Arizona State University in the1980s and go after the professor who was teaching Human Sexual Relations101 (VERY popular class) on the mall every Spring. Same Modus Operandi- worked okay for them (lots of spare change) until they got invited tospeak in front of the class and answer questions to the studentsthere. The professor didn't let them bully people and made sure theywere polite. They really made for a lively class session. I've seehorowitz speak before - He was so rude, he shamed the entire human race.
Being a contributor to the Southern Poverty Law Center, I noticed that they've done numerous articles on Horowitz. Here's one:http://www.splcenter.org/get-informed/intelligence-report/browse-all-issues/2011/winter/radical-campus-group-forges-ties-to-s