Arab Revolutionary Brigades n 1: a Palestinian international terrorist organization that split from the PLO in 1974; has conducted terrorist attacks in 20 countries; "in the 1980s the Fatah-RC was considered the most dangerous and murderous Palestinian terror group" [syn: {Fatah Revolutionary Council}, {Fatah-RC}, {Abu Nidal Organization}, {ANO}, {Arab Revolutionary Brigades}, {Black September}, {Revolutionary Organization of Socialist Muslims}]