Here in New York, Columbia University closed its campus to the public Thursday in response to two separate demonstrations led by pro-Palestine and pro-Israel student groups. In Massachusetts, the names and photos of several Harvard students who signed a pro-Palestinian letter were displayed on a billboard truck on campus Wednesday with a banner that read “Harvard’s Leading Antisemites.” Some of their names and personal information were also posted online. That action was organized by the ultraconservative nonprofit Accuracy in Media.