York City. 1960s Although it disdains parliamentarism as an end, the Progressive Labor Movement was quick to make use of the electoral process as a vehicle for propaganda, launching an effort to gain the signatures of 5,000 registered voters in New York City to put a PLP candidate on the ballot for the November 1963 election of the New York City Council. Although it did not manage to place its candidate on the ballot, the proto-PLP distributed more than 100,000 pieces of party literature in conjunction with the electoral campaign. The PLP remained of modest size throughout the decade. It did not publicize its membership, but federal income tax returns filed in 1967 and 1968 provide a reasonable proxy. The PLP formally existed as a publishing partnership listing Milt Rosen and the party's 1965 candidate for New York State Senate, Bill Epton, as partners. These returns showed income and expenditures of about $66,000 in 1967 and about $88,600 in 1968, with the partners claiming no income from the ostensible business relationship. During the 1960s, the PLP followed the international political line of the Chinese Communist Party and was described by commentators as "Maoist". The organization carved out a niche in the anti-Vietnam War movement, with its Worker Student Alliance faction acting as rivals to the Revolutionary Youth Movement faction within Students for a Democratic Society—the latter a self-described Maoist organization that had a minority faction that later evolved into the Weather Underground. The PLP made extensive use of mass organizations (front groups) from its earliest years, through which it spread its ideas, raised funds and recruited new members. Among these were the Student Committee for Travel to Cuba (1963–64), which organized travel to post-revolutionary Cuba; the Harlem Defense Council (1964), organized in response to racially oriented rioting in Harlem; the May 2nd Movement (M2M, established 1964), organized in opposition to the Vietnam War; and other short-lived, issue-driven front groups. 1970s The PLP ended its previous political line supporting the Cultural Revolution and broke with the People's Republic of China in the spring of 1971 with the publication of an internal discussion bulletin for party members detailing eight points of disagreement with the Chinese regime.<ref name=CPCLIne>"Progressive Labor Party Line on Communist China," in House Internal Security Committee, Progressive Labor Party: Hearings..." pg. 4431.</ref> These related to the softening of China's foreign relations towards Cambodia, North Korea, Romania, Yugoslavia, and the United