
Underworld
Criminal Context
Used to talk about crime, especially when involving organized groups like the mafia.

He wrote a book on the New York underworld.
Negative Connotation
'Underworld' often has a dark, dangerous feel, depicting a hidden criminal society.

The film noir explored the city's seedy underworld.
Hidden Operations
Refers to secret operations, not visible to law enforcement or the public.

Undercover agents infiltrate the underworld to gather intelligence.
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