On April 23, 1968, Students for a Democratic Society, Student Afro-American Society, and others began a nonviolent occupation of campus buildings that lasted nearly a week at Columbia University. Students and community supporters called for the university to cut its ties to research for the war in Vietnam and to end construction of a gym in Morningside Park. After negotiations failed, the administration sent in the police, injuring many and arresting over 700, triggering a campus-wide strike that shut down the university (from columbia1968.com).
Columbia University ended up terminating its contract with the Institute for Defense Analyses and decided not to build the gym in Morningside Park. Thirty students were suspended from Columbia as a result of the occupation and protests.
— source zinnedproject.org http://www.columbia1968.com/