Thousands in the Berkeley Free Speech Movement gathered on the steps of Sproul
Hall, the administration building at the University of California campus to protest four students being disciplined for distributing political literature. The leader of the orderly
sit-in was Mario Savio, seen below delivering his famous speech. Joan Baez was
there to lead in the singing, and to lend moral support. Shortly after 2 am on Dec. 
4th, police cordoned off the building, and at 3:30 am began arresting close to 800 students.

Joan Baez

Police arresting student protesters