The Progressive Labor Party (PLP) was formed in the fall of 1961 by members of the CPUSA who felt that the Soviet Union had betrayed communism and become revisionist amidst the Sino-Soviet Split. Progressive Labor Party founded the university campus-based May 2 Movement (M2M), which organized the first significant general march against the Vietnam War in New York City in 1964. However, once the Students for a Democratic Society (SDS) came to the forefront of the American leftist activist political scene in 1965, PLP dissolved M2M and entered SDS, working vigorously to attract supporters and to form party clubs on campuses. On the other hand, the Trotskyist Socialist Workers Party (SWP) supported both the civil rights movement and the black nationalist movement which grew during the 1960s. It particularly praised the militancy of black nationalist leader Malcolm X, who in turn spoke at the SWP's public forums and gave an interview to the "Young Socialist". Like all left wing groups, the SWP grew during the 1960s and experienced a particularly brisk growth in the first years of the 1970s. Much of this was due to its involvement in many of the campaigns and demonstrations against the war in Vietnam.