Controversy exploded in 1964 when Berkeley students led the Free Speech Movement in protest of regulations limiting political activities on campus, including Civil Rights advocacy and protests against the Vietnam War. It culminated in hundreds of arrested students at a sit-in. Kerr's initial decision was to not expel University of California students that participated in sit-ins off campus. That decision evolved into reluctance to expel students who later would protest on campus in a series of escalating events on the Berkeley campus in late 1964. Kerr was criticized both by students for not agreeing to their demands and by conservative UC Regent Edwin Pauley and others for responding too leniently to the student unrest.