vigil vs work-to-rule

vigil

noun
  • A quiet demonstration in support of a cause. 

  • A period of observation or surveillance at any hour. 

  • An instance of keeping awake during normal sleeping hours, especially to keep watch or pray. 

  • The eve of a religious festival in which staying awake is part of the ritual devotions. 

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 vigil and work-to-rule occurred in a corpus of books? (source: Google Ngram Viewer )