Riot Act
WordNet

noun


(1)   A former English law requiring mobs to disperse after a magistrate reads the law to them
(2)   A vigorous reprimand
"I read him the riot act"
WiktionaryText

Etymology


Properly An act for preventing tumults and riotous assemblies, and for the more speedy and effectual punishing the rioters — 1715

Proper noun



  1. An English law that stated that if 12 or more people assembled unlawfully in a public place they must disperse when read a proclamation
 
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