A demonstrator pumps his fist as he hangs a sign from a window in Hamilton Hall inside the Colu …

A demonstrator pumps his fist as he hangs a sign from a window in Hamilton Hall inside the Colu ...

A demonstrator pumps his fist as he hangs a sign from a window in Hamilton Hall inside the Columbia University campus, Tuesday, April 30, 2024, in New York. (AP Photo/Mary Altaffer)