By mid-1985 Amal was also in conflict with the Druze Progressive Socialist Party (PSP) and its militia, the People's Liberation Army (PLA), led by Walid Jumblatt in the mountainous Chouf region. As Amal-PSP relations severely deteriorated, the Palestinian alliance with the Druze PSP was re-established. Unlike the majority of other Lebanese leftist militias, the Communist Action Organization in Lebanon (OCAL), led by Muhsin Ibrahim, refused to cooperate with Syria in its attempts to vanquish Arafat. This refusal brought the wrath of the Syrians on the OCAL, forcing them to operate underground from 1987 onwards.