Underworld
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Criminal Context
Used to talk about crime, especially when involving organized groups like the mafia. He wrote a book on the New York underworld.
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Negative Connotation
'Underworld' often has a dark, dangerous feel, depicting a hidden criminal society. The film noir explored the city's seedy underworld.
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Hidden Operations
Refers to secret operations, not visible to law enforcement or the public. Undercover agents infiltrate the underworld to gather intelligence.