These forces enabled the PLO / Fatah (Fatah constituted 80% of the membership of the PLO and Fatah guerrillas controlled most of its institutions now) to transform the Western Part of Beirut into its stronghold. The PLO had taken over the heart of Sidon and Tyre in the early 1970s, it controlled great swathes of south Lebanon, in which the indigenous Shiite population had to suffer the humiliation of passing through PLO checkpoints and now they had worked their way by force into Beirut. The PLO did this with the assistance of so-called volunteers from Libya and Algeria shipped in through the ports it controlled, as well as a number of Sunni Lebanese groups who had been trained and armed by PLO/ Fatah and encouraged to declare themselves as separate militias. However, as Rex Brynen makes clear in his publication on the PLO, these militias were nothing more than "shop-fronts" or in Arabic "Dakakin" for Fatah, armed gangs with no ideological foundation and no organic reason for their existence save the fact their individual members were put on PLO/ Fatah payroll.