In 1969, a faction of the left-wing Popular Front for the Liberation of Palestine (PFLP) broke away from the main organization to form the Popular Democratic Front for the Liberation of Palestine (PDFLP). The PDFLP was headed by Secretary-General Nayef Hawatmeh, who had been referred to as a leader of the PFLP's Maoist tendency. He believed that the PFLP had become, under the guidance of George Habash, too focused on military matters, and wanted to make the PDFLP a more grassroots and more ideologically focused organization.
Source: Wikipedia
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Curator's note: Later the PDFLP dropped "Popular" from its name and became the "Democratic Front for the Liberation of Palestine - DFLP".