The GAP was formed during Salvador Allende's 1970 presidential campaign by Fernando Gómez, a member of the Cuban-trained Bolivian guerrilla group the ELN, at the instigation of Allende's daughter, Beatriz Allende. By the time of the election, the GAP had expanded with the addition of more ex-ELN combatants volunteering to provide security to Allende and, later, members of the Revolutionary Left Movement (MIR).