law unto oneself
law unto oneself {n. phr.}, {literary}
A person who does only what he wishes; a person who ignores or breaks the law when he doesn't like it.
Everybody in Germany feared Hitler because he was a law unto himself.
Mr. Brown told Johnny that he must stop trying to be a law unto himself.
Compare: TAKE THE LAW INTO ONE'S OWN HANDS.
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Source: A Dictionary of American Idioms
