WordNet (r) 3.0 (2006):

banditry
    n 1: the practice of plundering in gangs

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "banditry":
   armed robbery, asportation, assault and robbery, bank robbery,
   brigandage, brigandism, cattle lifting, cattle stealing,
   depredation, despoiling, despoilment, despoliation, direption,
   extortion, foraging, foray, freebooting, heist, highway robbery,
   hijacking, holdup, looting, marauding, mugging, pillage, pillaging,
   plunder, plundering, pocket picking, purse snatching, raid,
   raiding, ransacking, rape, rapine, ravage, ravagement, ravaging,
   ravishment, razzia, reiving, rifling, robbery, robbing, sack,
   sacking, spoiling, spoliation, stickup, stickup job