If the protester was arrested, then the record of that is available, although it's probably listed as a misdemeanor trespassing charge. But, you have to know the person's name to even get that far.Not if the names were made public - like arrest records (not the Duke situation, but the Hamas protestors taking over campuses)
Group them together as a blacklist of Pro-Palestinian campus protestors, and there isn't a lawyer in the country that wouldn't jump on that easily winnable libel charge.
You know I'm right.