lie-in vs protester

lie-in

noun
  • A form of protest where a group of people lie down in a public area. 

  • A period spent lying in bed for longer than usual after one has woken up. 

protester

noun
  • One who protests, either alone or in a public display of group feeling. 

  • One who protests a bill of exchange, or note. 

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