In the fall of 1964, the Free Speech Movement began in Berkeley, a phenomenon which spread to many other college campuses in the following years. In December 1964, the police arrested 774 people in the Sproul Hall Sit-in, the largest mass arrest undertaken in the country up to that time. After the Free Speech Movement, there were seven years of frequent, and sometimes violent demonstrations, including draft protests, strikes, bombings of the ROTC building and PG&E Towers, arsons, and street battles.