Recent days have witnessed what Jewish students and watchdog groups describe as a raft of antisemitic incidents on college campuses. Jewish students at Cooper Union in New York City sheltered in a library as pro-Palestinian demonstrators banged on the glass walls of the building. At a pro-Palestinian protest near Tulane University, at least two students were assaulted in a melee that began when someone tried to burn an Israeli flag. And anonymous posters flooded a Cornell message board with threats, prompting the school’s president to alert the FBI. “If you see a Jewish ‘person’ on campus follow them home and slit their throats,” one message said. Another threatened to “bring an assault rifle to campus and shoot all you pig jews.”