Black market (organization)
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Until the episode "Black Market", the underground organization was headed by Phelan. Under Phelan, the black market regularly withheld inventory to inflate prices. The black market was also known for other dealings, some of which crossed the line between "merely" illegal and completely anathematic.
After Phelan's death, Lee Adama explains to Phelan's likely successors that, as long as these shady practices stop, the black market will be allowed to continue business. Despite the President's misgivings, the black market still functions within the Fleet, and is essential in distributing hard to find supplies.