Members of the Columbia University Apartheid Divest group, including Sueda Polat, second from left, and Mahmoud Khalil, center, are surrounded by members of the media outside the Columbia University campus, Tuesday, April 30, 2024, in New York. (AP Photo/Mary Altaffer, File)
NEW YORK (AP) — When protests over the Israel-Hamas war took root on Columbia University's campus last spring, Mahmoud Khalil became a familiar, outspoken figure in a student movement that soon spread to other U.S. colleges.