stop-work vs work-to-rule

stop-work

noun
  • Temporary cessation of labor as a form of protest. 

  • Causing work to cease temporarily for administrative reasons such as safety concerns or legal action. 

work-to-rule

noun
  • A labor protest in which employees do only the minimum work required by the rules of a workplace, following safety or other regulations to the letter in order to cause a slowdown. 

adj
  • Of or pertaining to such a protest. 

How often have the words stop-work and work-to-rule occurred in a corpus of books? (source: Google Ngram Viewer )