Read someone the riot act
Meaning
Scold someone severely to discourage bad behavior.
Usage
Used when issuing a stern warning.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
England's 1714 Riot Act required crowds to disperse or face arrest.
Phrase appears in newspapers describing the actual act being read aloud.