FILE - New York City police enter an upper floor of Hamilton Hall on the Columbia University campus using a tactical vehicle, in New York Tuesday, April 30, 2024, after a building was taken over by protesters earlier Tuesday. Colleges and universities have long been protected places for free expression without pressure or punishment. But protests over Israel's conduct of the war in Gaza in its hunt for Hamas after the Oct. 7 massacre has tested that ideal around the world. (AP Photo/Craig Ruttle, File)