CHICAGO — Dozens of students protesting the war in Gaza walked out of the University of Chicago’s commencement Saturday as the school withheld the diplomas of four seniors over their involvement with a pro-Palestinian encampment.

The disruption to the rainy two-hour outdoor ceremony was brief, with shouts, boos and calls to “Stop Genocide.” A crowd of students walked out between speeches, and a demonstration followed the official ceremony. Some chanted as they held Palestinian…