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.ru: Преступный мир
examples
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The police are working hard to infiltrate the criminal underworld and dismantle the drug smuggling ring.
Полиция усердно работает, чтобы внедриться в преступный мир и ликвидировать сеть контрабанды наркотиков.