N EW YORK — Columbia University senior Maryam Alwan was visiting family in Jordan over winter break when she received an email from the school accusing her of harassment. Her supposed top offense: writing an op-ed in the student newspaper calling for divestment from Israel. The university has launched a flurry of investigations, led by a new disciplinary committee—the Office of Institutional Equity—to identify Columbia students who have expressed criticism of Israel, according to records shared