He renamed the organization the National Mobilization Committee to End the War in Vietnam, recruited members of many diverse groups, and organized the April 15, 1967 march from Central Park to the United Nations Building in New York City. Originally planned as a rally in Central Park, the United Nations Anti-Vietnam War March became the largest demonstration in American history to that date. During his speech to the crowd that day, Bevel called for a larger march in Washington D.C., a plan that evolved into the October 1967 March on the Pentagon. This rally was attended by tens of thousands of peace activists who followed the growing counterculture movement.