Columbia University says it has expelled or suspended some students who took over a campus building during pro-Palestinian protests last spring, and had temporarily revoked the diplomas of some students who have since graduated. In a campus-wide e-mail sent Thursday, the university said its judicial board had issued its sanctions against dozens of students who occupied Hamilton Hall based on its “evaluation of the severity of behaviours.” The university did not provide a breakdown of how many students were expelled, suspended or had their degree revoked. The culmination of the months-long investigative process comes as the university’s activist community is...