The anti-Vietnam War movement grew out of existing peace and social justice organizations involved in civil rights or anti-nuclear activities. Mass demonstrations, typically organized by broad coalitions of national and local groups, attracted the greatest publicity, but most antiwar efforts took place at the local level. Political liberals made up the movement's largest constituency, initially through groups such as the American Friends Service Committee, the Committee for a Sane Nuclear Policy (SANE), and Women Strike for Peace. The antiwar actions of the fall culminated with the 21 October 1967 March on the Pentagon. Nearly 100,000 people attended a Washington DC rally at the Lincoln Memorial, with speakers calling for a bombing halt, a negotiated settlement, and US withdrawal from Vietnam. Antiwar activity escalated during 1967 as new organizations formed or older ones shifted their focus to ending the war. Greater numbers of people unaffiliated with organized political and social groups attended demonstrations as frustration with the war grew.