The Collaborative International Dictionary of English v.0.48:

go-slow \go-slow\ n.
   A form of labor protest by workers in which they deliberately
   slow down in order to cause problems for their employers.
   [British]
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

go-slow
    n 1: a form of protest by workers in which they deliberately
         slow down in order to cause problem from their employers