On the political side of the labor movement, Rustin increased his visibility as a leader of the American social democracy. In early 1972, he became a national co-chairman of the Socialist Party of America. In December 1972, when the Socialist Party changed its name to Social Democrats, USA (SDUSA) by a vote of 73–34, Rustin continued to serve as national co-chairman, along with Charles S. Zimmerman of the International Ladies Garment Workers' Union (ILGWU). In his opening speech to the December 1972 Convention, Co-Chairman Rustin called for SDUSA to organize against the "reactionary policies of the Nixon Administration"; Rustin also criticized the "irresponsibility and élitism of the 'New Politics' liberals". In later years, Rustin served as the national chairman of SDUSA.