From April 23 to April 30, 1968, Hundreds of Columbia University students occupied and barricaded five buildings on the Morningside Heights campus. They were protesting Columbia’s plan to build a private gym in Morningside Park—an “apartheid gym,” as they saw it, which would exclude the local black community, as well as disciplinary measures taken against student anti-war demonstrators. Afraid a confrontation might spark riots in nearby Harlem, Columbia President Grayson Kirk held back from calling in the police.

On April 30, Columbia called in the NYPD to clear the buildings. Police arrested 705 students, at least 150 of whom they beat; more violence erupted on May 1 in skirmishes between police and demonstrators. policemen were also injured, one seriously. Lindsay publicly praised the “restraint” of most police, while admitting that some “used excessive force.”