New York Times, 1 May 1968, p.34: "Tense Moments: Police and sit-ins confront each other at Hamilton Hall before action. William H. Booth, Human Rights Chief, is at right center." Filmmaker Melvin Morgulis is at far right on the Jefferson statue. Far left, facing the police: defenders of the building occupiers. The police arrived on campus around midnight and were ready to move by 1:00am but, according to the Times article, were ordered to "wait until Harlem was asleep", and so didn't act until 2:30am.