PGT-Alamos was formed as a regroupment of the few elements in the Alamos region of the erstwhile Guatemalan Party of Labour - Communist Party (PGT-PC) that survived the 1983 purges against the organisation.
Following the 1983 purges, PGT-Alamos arose as a leftover from the original Guatemalan Labour Party-Communist Party (PGT-PC) in the Alamos region, which endured and reorganized itself.