ochlocracy
noun
och·loc·ra·cy ä-ˈklä-krə-sē 
: government by the mob : mob rule
ochlocrat
ˈä-klə-ˌkrat
noun ochlocratic
ˌä-klə-ˈkra-tik
adjective or ochlocratical
ˌä-klə-ˈkra-ti-kəl
Example Sentences
Recent Examples on the Web More commonly, ochlocracy functions through the legitimate organs of the state or through other entities, such as businesses and professional associations. 
Kevin D. Williamson, National Review, 6 June 2019
Kevin D. Williamson, National Review, 6 June 2019 Word History
Etymology
Greek & Middle French; Middle French ochlocratie, from Greek ochlokratia, from ochlos mob + -kratia -cracy
First Known Use
1594, in the meaning defined above