الجبهة الديمقراطية لتحرير فلسطين
According to a declassified CIA report, the PPLO broke off from the Popular Democratic Front for the Liberation of Palestine (PDFLP). In May–June 1969, the Palestinian Revolutionary Left League and the PPLO merged into the PDFLP. In February 1970 the PPLO joined the United Fedayeen Command.