In 1972, the Socialist Party voted to rename itself as Social Democrats, USA (SDUSA) by a vote of 73 to 34 at its December Convention. Its National Chairmen were Bayard Rustin, a peace and civil rights leader; and Charles S. Zimmerman, an officer of the International Ladies Garment Workers Union (ILGWU). In 1973, Michael Harrington resigned from SDUSA and founded the Democratic Socialist Organizing Committee (DSOC), which attracted many of his followers from the former Socialist Party. That same year, David McReynolds and others from the pacifist and immediate-withdrawal wing of the former Socialist Party formed the Socialist Party USA (SPUSA). Bayard Rustin was the national chairperson of SDUSA during the 1970s. SDUSA sponsored a biannual conference that featured discussions, for which SDUSA invited outside academic, political and labor union leaders. These meetings also functioned as reunions for political activists and intellectuals, some of whom worked together for decades.