Black market

Black market is a term for an illegal economy that is not regulated. Many goods are sold in this manner, such as weapons and drugs.

The black market thrived on Terok Nor during the Occupation and was run by individuals such as Quark and Ibudan. 

Quark would later maintain links with the black market when the station became Deep Space 9, although under Odo's constant watch. 

Romulan remat detonators are sold on the black market. 

After she stole the USS Platte, Pak Dorren planned to sell its tritium on the black market. 

In 2372, Varis Sul dabbled in the black market for much needed supplies. but almost lost her position as Tetrarch as a result.