assizes vs kangaroo court

assizes

noun
  • A trial or hearing before such a court. 

  • The regional courts of Great Britain, which were replaced by the Crown Courts in 1971. 

kangaroo court

noun
  • A judicial or quasi-judicial proceeding, or a group of people which conducts such proceedings, which is without proper authority, and often acts abusively or decides unjustly. 

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