@adam is incorrect about the campus protests on several points.
1) While people have freedom of speech, they don't have freedom to harass. Preventing Jews from entering buildings, or walking in the same public spaces everyone else enjoys is literally harassment.
2) The protesters on and off campus cannot be compartmentalized. They're together.
Private universities don't have to put up with this. Some don't. But Columbia WANTS the kind of students who're attracted to this bigoted radicalism.