A sign outside Harvard Yard warns that only those with Harvard IDs can enter the yard, outside …

A sign outside Harvard Yard warns that only those with Harvard IDs can enter the yard, outside Harvard University Monday, April 22, 2024, in Cambridge, Mass. The sign also cautions that any structures, like the tents and tables used at protests at other colleges, aren’t allowed without permission and students caught violating the policies are subject to disciplinary action. (AP Photo/Steve LeBlanc)