firebrand vs ringleader

firebrand

noun
  • An argumentative troublemaker or revolutionary; one who agitates against the status quo. 

  • A torch or other burning stick with a flame at one end. 

ringleader

noun
  • A person who starts and leads a disturbance (such as a riot), a conspiracy, or a criminal gang. 

  • A leader of a group of people, especially an unofficial group. 

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