The Phalanges , allies to the Israeli Defence Forces ( IDF ) , were ordered Request by the IDF to clear out Palestine Liberation Organization ( PLO ) fighters from Sabra and Shatila , as part of the IDF maneuvering into West Beirut .

The IDF received Receiving reports Reporting of some of the Phalanges atrocities in Sabra and Shatila but failed to take any action to prevent Preventing_or_letting or stop Preventing_or_letting the massacre Killing .

According to Alain Menargues , the direct perpetrators of the killings Killing were the `` Young Men '' , a gang recruited by Elie Hobeika , a prominent figure in the Phalanges , the Lebanese Forces intelligence chief and liaison officer with Mossad , from men who had been expelled Removing from the Lebanese Forces for insubordination or criminal activities .