http://www.brevestoriadelcinema.org/storia-del-cinema/04-gli-anni-venti/04-6-il-cinema-comico-degli-anni-venti/
Cops is a 1922 comedy short silent film about a young man (Buster Keaton) who accidentally gets on the bad side of the entire Los Angeles Police Department during a parade, and is chased all over town. It was written and directed by Edward F. Cline and Keaton.