In 1964 the ANM branch in Oman participated in the formation of the Dhofar Liberation Front (DLF). The ANM as a whole supported the Dhofar struggle. NLFD later transformed into the Popular Front for the Liberation of the Occupied Arabian Gulf (PFLOAG), later the Popular Front for the Liberation of Oman (PFLO). This group led an insurgency in Dhofar for several years in the 1960s and early 1970s, driving government forces from large swaths of territory. It was eventually defeated in the early 1970s by Sultan Qaboos, backed by British and Iranian forces. After resistance inside Oman was broken in 1975, the group remained as a minor military and political force based in the sympathetic neighboring state of South Yemen, which had backed the Dhofar rebellion, until the 1980s.