Jewish graduates of Columbia University tore into their alma mater for allegedly failing to rein in antisemitism on campus — telling administrators they need to “do their job.” “Who could have ever imagined that Columbia University would be the site for rallies calling for Intifada, for swastikas scrawled on campus property and for Jewish students to be intimidated and followed as they walk home from class,” said Matt Schweber, a member of the newly formed Columbia University Jewish Alumni Association. “Our message today: enough is enough,” Schweber said in a statement provided to The Post. “It must be stopped. The...