 At the time of its founding IU consisted of eight parties, including the Revolutionary Left Movement - Free Bolivia (MIR-BL), the Communist Party of Bolivia (PCB), the Socialist Party-1 (PS-1), the Axis of Patriotic Convergence (ECP), the Movement for Socialist-Unzaguist (MAS-U) and FOM.The candidate of IU for president in 1989 was the MIR-BL leader Antonio Aranibar.The vice presidential candidate of the coalition was Walter Delgadillo, ex-general secretary of the "Central Obrera Boliviana" trade union confederation.