criminal underworld
definitions
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The organized community of criminals, gangs, and syndicates that operate illegal activities outside the law and often in secret.pt: Submundo do crime
examples
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The police are working hard to infiltrate the criminal underworld and dismantle the drug smuggling ring.
A polícia está trabalhando duro para infiltrar o submundo do crime e desmantelar a rede de contrabando de drogas.