term New Left was popularised in the United States in an open letter written in 1960 by sociologist C. Wright Mills (1916–1962), entitled Letter to the New Left. Mills argued for a new leftist ideology, moving away from the traditional focus on labor issues (Old Left), towards issues such as opposing alienation, anomie and authoritarianism. Mills argued for a shift from traditional leftism toward the values of the counterculture and emphasized an international perspective on the movement. According to David Burner, C Wright Mills claimed that the proletariat were no longer the revolutionary force as the new agent of revolutionary change were young intellectuals around the world. In the wake of the downfall of Senator McCarthy (who never served in the House, nor HUAC), the prestige of HUAC began a gradual decline beginning in the late 1950s. By 1959, the committee was being denounced by former President Harry S. Truman as the "most un-American thing in the country today." The committee lost considerable prestige as the 1960s progressed, increasingly becoming the target of political satirists and the defiance of a new generation of political activists. HUAC subpoenaed Jerry Rubin and Abbie Hoffman of the Yippies in 1967 and again in the aftermath of the 1968 Democratic National Convention. The Yippies used the media attention to make a mockery of the proceedings. Rubin came to one session dressed as a United States Revolutionary War soldier and passed out copies of the United States Declaration of Independence to people in attendance. Rubin then "blew giant gum bubbles while his co-witnesses taunted the committee with Nazi salutes." 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