Wordnet 3.0
NOUN (1)
1. 
 a terrorist group of radical Palestinians who split with al-Fatah in 1967 but now have close relations with al-Fatah; 
 staged terrorist attacks against Israel across the Lebanese border; 
[syn: Popular Struggle Front, PSF]
WordNet (r) 3.0 (2006):
Popular Struggle Front
    n 1: a terrorist group of radical Palestinians who split with
         al-Fatah in 1967 but now have close relations with al-
         Fatah; staged terrorist attacks against Israel across the
         Lebanese border [syn: Popular Struggle Front, PSF]