agitator vs political agitator

agitator

noun
  • An implement for shaking or mixing. 

  • One of a body of men appointed by the army, in Oliver Cromwell's time, to look after their interests. 

  • One who agitates; one who stirs up or excites others, for example political reformers. 

political agitator

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