Pressure is building on Columbia University to enact an official campus mask ban as Jewish alumni groups compare anti-Israel protesters hiding their identities to the Ku Klux Klan and elected officials, including Mayor Eric Adams, say the face coverings give cover to criminals. The renewed push to outlaw masks comes amid fresh protests sparked by the arrest of Mahmoud Khalil, 30, a Palestinian former Columbia grad student who played an instrumental role in anti-Israel demonstration organized by student groups who praised Hamas and the Oct. 7 terror attacks. “Masks and face coverings at rallies — whether a white hood or...