Heavliy armed black students leave Straight Hall at Cornell University in Ithica, N.Y., on April 20, 1969. The students had barricaded themselves in the building led by Ed Whitfield, far right, demanding a degree-granting Afro-American Studies program. After a 36 hour sit-in, University administrators offered to drop some charges against the students and accelerate the opening of an Afro-American Studies center. (AP Photo/Steve Starr)