April 23, 1968 –
Students at Columbia University in New York City begin a week long occupation of several campus buildings protesting the Universities affiliation with the Institute for Defense Analyses (IDA), a weapons research think-tank affiliated with the U.S. Department of Defense.
Students had been demonstrating earlier in March but the Columbia Administration had placed on probation six anti-war Columbia student activists for violating the ban on indoor demonstrations, which in turn caused the students to become more hard line in their protests.
The Haus of Dcaligari 