Zaidan was born in 1948 in Safed, Palestine, though other sources state that he was born in a Syrian refugee camp.

 

He studied at the Damascus University where he joined the radical, pro-Syrian Popular Front for the Liberation of Palestine – General Command (PFLP-GC) under Ahmed Jibril in 1968. In 1977, major disagreements arose between the PFLP-GC, the Palestine Liberation Organization (PLO), and other Palestinian factions based in Lebanon. Zaidan, who opposed Syrian involvement in the Lebanese war, left the PFLP-GC and created the PLF with Talaat Yaacoub, which eventually split into three separate factions (and then later re-merged). Zaydan's faction of the PLF, which was the largest of the three, moved its headquarters to Tunisia.

Since its inception in 1977, the Abbas-led PLF was a member of the Palestine Liberation Organization and received support from both the PLO and Yasser Arafat's Fatah movement. Unlike the PFLP-GC, the PLF has supported peace negotiations between Israel and the Palestinians. Zaidan was elected to the Executive Committee of the PLO in 1984 and represented the Palestinian National Council (PNC) in 1989 during peace negotiations with Israel. Although Zaidan was wanted by Israel for his involvement in guerrilla attacks against Israel (including attacks against civilians) throughout the 1970s, 1980s and 1990s, Israel allowed him to travel freely in the Gaza Strip throughout the 1990s because he supported the peace negotiations. One notable attack by the PLF under Zaidan's leadership resulted in the deaths of Danny Haran (age 28) and his two daughters, Einat (4) and Yael (2) in April 1979 in their Nahariya, Israel home by Samir Kuntar. 

On April 15, 2003, Zaidan was captured by American forces in Iraq while attempting to flee from Baghdad to Syria. Italy subsequently requested his extradition. The Pentagon reported on March 9, 2004 that Zaidan had died the previous day, of natural causes, while in U.S. custody. The PLF accused the Americans of assassinating their leader. The U.S. authorities agreed to give Abbas' body to the Palestine Red Crescent Society for burial in Ramallah on the West Bank, Palestine. However, his burial there was blocked by the Israeli authorities, and he was buried in the Martyrs' Cemetery in Damascus instead.



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