Black Market

noun a person, place, thing, or idea

adjective a word that describes or modifies a noun or pronoun

• The authorities are cracking down on illicit business activities in the city.
• I heard that some of the guys are involved in some shady business deals.
• They're running an underground operation, doing some sketchy business on the side.
• The illicit business of spreading rumors can be just as damaging as any other illegal activity.

noun a group of individuals working together to engage in illegal activities for financial gain

• The investigation uncovered a sophisticated network of organized crime operating in the city.
• I heard that the organized crime syndicate is behind the recent string of robberies.
• The cops are cracking down on the organized crime ring in the neighborhood.
• Corruption in the government was like an organized crime, with officials working together for their own gain.