WordNet (r) 3.0 (2006):

work stoppage
    n 1: a group's refusal to work in protest against low pay or bad
         work conditions; "the strike lasted more than a month
         before it was settled" [syn: strike, work stoppage]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "work stoppage":
   arrest, bell, boycott, boycottage, check, checkmate, cutoff,
   dead stop, deadlock, end, endgame, ending, final whistle,
   full stop, grinding halt, gun, halt, job action, lockout,
   outlaw strike, revolt, rulebook slowdown, sick-in, sit-down,
   sit-down strike, slowdown, stalemate, stand, standoff, standstill,
   stay, stop, stoppage, strike, sympathy strike, tie-up, turnout,
   walkout, wildcat strike