Notice of Trespass sign posted on barricades informing protesters in encampment on University of Pennsylvania campus on Monday, April 29, 2024. Colleges around the U.S. implored pro-Palestinian student protesters to clear out tent encampments with rising levels of urgency Monday. College classes nationwide are wrapping up for the semester, and campuses are preparing for graduation ceremonies. (Alejandro A. Alvarez/The Philadelphia Inquirer via AP)