The Spring Mobilization to End the War in Vietnam was organized on November 26, 1966, to sponsor antiwar demonstrations in the spring of 1967. Veteran peace activist A. J. Muste was chairman of the group, and its four vice chairmen were David Dellinger, editor of Liberation; Edward Keating, publisher of Ramparts; Sidney Peck, a professor at Case Western Reserve University; and Robert Greenblatt, a professor at Cornell University. In January 1967, they named the Reverend James Luther Bevel, a close colleague of Martin Luther King, Jr., as director of the Spring Mobilization to End the War in Vietnam. During the next four months, they prepared for mass demonstrations, one scheduled for New York City, and the other for San Francisco, and on April 15, 1967, the demonstrations occurred. More than 125,000 people marched in New York City against the war—including Martin Luther King, Jr., James Luther Bevel, and Benjamin Spock—and another 60,000 marched in San Francisco. Up to its time, the Spring Mobilization was the largest antiwar demonstration in U.S. history.