intervention vs political opposition

intervention

noun
  • A legal motion through which a person or entity who has not been named as a party to a case seeks to have the court order that they be made a party. 

  • An orchestrated attempt to convince somebody with an addiction or other psychological problem to seek professional help and/or change their behavior. 

  • The action of intervening; interfering in some course of events. 

  • An action taken or procedure performed; an operation. 

political opposition

noun
  • A recognized political party or group of parties in multiparty political systems that is present in Parliament or some other legislative body and does not control the floor (usually due to being in the minority). 

  • An unrecognized political party in a one-party state. 

  • Actions by one political group against another political group, either by using governmental power or by popular actions such as protests; generally, disagreement in politics. 

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