Pinned The police moved Thursday afternoon to quell a protest at Columbia University, where demonstrators constructed a vast encampment and university leaders appeared to be making good on their pledge to Congress this week to crack down on unauthorized student protests tied to the war in Gaza. The students have set up dozens of tents on the South Lawn of the campus, in front of the Butler Library. They have also set up a makeshift kitchen and held a teach-in and a film screening. Though Columbia administrators have closed the campus’s gates to outsiders, hundreds of students and others rallied...