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Public Enemy Number One

or Public Enemy Number 1, Public Enemy No. 1

noun
1.
(not in official use) a criminal at the top of the FBI's list of the ten most wanted criminals.
2.
a major menace to public safety, health, etc.:
Cancer is Public Enemy Number One.
Origin of Public Enemy Number One
1930-1935
An Americanism dating back to 1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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