industrial action vs stop-work

industrial action

noun
  • A workplace protest by employees designed to inconvenience or disrupt the business of the employer. 

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. 

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