1) (CrisiS)
The crisis in Jordan in September 1970 between the Hashemite kingdom of Jordan and segments of the Palestine Liberation Organization (PLO), particularly the Popular Front for the Liberation of Palestine and the Democratic Front for the Liberation of Palestine. Palestinians challenged the authority of King Hussein and sought to operate without constraint from Jordan against Israel. Tensions between the PLO and Jordan deteriorated into open conflict on 1 September 1970. A formal cease-fire ended the conflict, and the PLO's use of Jordan as a base of operations against Israel ended. The PLO shifted its bases to Syria and then to Lebanon.
2) (Terrorist group)
A Palestinian terrorist group, it was responsible for the kidnapping and murder of Israeli athletes at the 1972 Summer Olympic Games in Munich, Germany.
Historical Dictionary of Israel. Bernard Reich David H. Goldberg. Edited by Jon Woronoff..