A Columbia University student left the country this week after the State Department revoked the person’s visa, according to Homeland Security.Ranjani Srinivasan’s student visa was canceled on March 5 for “advocating for violence and terrorism,

Between classes, when throngs of students stream into and out of Columbia University’s campus, the security lines can back up like a TSA checkpoint. There’s a switch-back path of metal fencing that leads into a white tent, where two sets of guards check and then swipe campus ID cards before letting students in and out.