[7] In 1964, Ibrahim took part in meeting with Nasser, as the Arab Nationalist Movement tried to convince him to support the Dhofar Rebellion.
[8] Ibrahim was part of a tendency a within the Arab Nationalist Movement, including Nayef Hawatmeh, Mohammed Kishli, Bilal al-Hasan and Abdel Fattah Ismail, that became increasing inspired by the Cuban, Chinese and Vietnamese revolutions and began to gear towards Marxism.
[8] The defeat of Egypt in the 1967 Six-Day War aggravated the divisions within the Arab Nationalist Movement, with the tendency of Ibrahim, Hawatmeh and Ismail moving from nationalism to Marxism-Leninism.
[1] In 1975 Ibrahim was named general secretary of OACL (hitherto the organization had a collective leadership), a post he was to occupy until his death.
[16][3][5] Ibrahim was part of the Tunis-based negotiation team of the Palestine Liberation Organization in the process leading up to the Oslo Accords.
[14] Following the killing of George Hawi, at the fortieth-day observation of Hawi's death, Ibrahim broke his silence in Lebanese politics and issued a strong self-criticism on the role of the Lebanese left during the civil war (having allowed the Palestinian movement to set its agenda and for having attempted to confront the sectarian system in Lebanon without understanding its underlying causes).
[17] Attendees at the funeral included Progressive Socialist Party leader Walid Jumblatt, former parliamentarian and PSP leader Ghazi Aridi, Lebanese Communist Party general secretary Hanna Gharib and the parliamentarians Osama Saad, Yassine Jaber and Ali Osseiran, the representative of PLO and Fatah in Lebanon Fathi Abu Al-Ardat and the Palestinian ambassador to Lebanon Ashraf Dabour.