lackey vs wage slave

lackey

noun
  • A footman, a liveried male servant. 

  • A fawning, servile follower. 

verb
  • To attend, wait upon, serve obsequiously. 

wage slave

noun
  • Someone who does very unpleasant or drudging work for a wage. 

  • Someone who works for wages and has little to no professional autonomy. 

How often have the words lackey and wage slave occurred in a corpus of books? (source: Google Ngram Viewer )