In early 1968, Nayef Hawatmeh and a group that included a number of Palestinian and non-Palestinian Arabs also left the ANM [Arab Nationalist Movement] to join the PFLP. The PFLP, however, was divided by the transplanted ideological struggle between the so-called left and right factions, with the leftist minority represented by Saleh Ra’fat, ‘Omar al-Qassem, Yasser ‘Abd-Rabbo, Hawatmeh, Mamdouh Nowfal, Muhammad Katmattu, and Hasan Ju‘ba, among others (Y. Sayigh 1997, 208, 228). During the August 1968 congress of the PFLP, while [George] Habash was imprisoned in Syria, the group revised the platform of the PFLP to incorporate class struggle as an important component (International Documents on Palestine [IDP] 1971, 424) and came to dominate the new PFLP Executive Committee. After Habash’s prison escape in November 1968, the PFLP Executive Committee was reformulated to include only one of the dissidents (El-Rayyes and Nahas 1974, 37). When the PFLP leadership attempted to purge the dissenters, Fateh intervened (O’Neill 1978, 129). This conflict was resolved when the dissenters split from the PFLP to form the DFLP.

— Resistance, repression, and gender politics in occupied Palestine and Jordan by Frances Susan Hasso (Gender, culture, and politics in the Middle East) (Page 8 - 9)