56 years ago on April 23rd, 1968
Protesters occupy Hamilton Hall at Columbia University
The protest was in opposition to Columbia's plan to build a proposed segregated gym in Morningside Park and the college's participation in a weapons research think-tank. The occupation would continue for seven days, when the NYPD fired tear gas into the buildings and arrested more than 700 people. The college withdrew from the weapons research program and scrapped plans to build the gym.