From WordNet (r) 3.0 (2006):
mob
n 1: a disorderly crowd of people [syn: mob, rabble, rout]
2: a loose affiliation of gangsters in charge of organized
criminal activities [syn: syndicate, crime syndicate,
mob, family]
3: an association of criminals; "police tried to break up the
gang"; "a pack of thieves" [syn: gang, pack, ring,
mob]
v 1: press tightly together or cram; "The crowd packed the
auditorium" [syn: throng, mob, pack, pile, jam]