The Skhin Corparation was the company named after and run by Nabisco Shkin. The company was a very large slaving concern employing ruthless tactics from its headquarters on Brighton and shipped most slaves it processed off to Nuevo Maya to fight gory spectacles in gladiatorial combat, house/domestic slaves were the lesser concern of the organisation.
By the time of Infernal Devices the corporation had struck a deal with Brighton's mayor Nimrod Pennyroyal to process any captured Lost Boys from Grimsby and presumably with other cities, accepting Green Storm prisoners like Theo Ngoni from other cities in the TSGS. If the slavery wasn't already unsavory enough the corporation also employed and ran snatch squads. Groups of thugs and hired men that would raid the lowermost tiers and decks of traction towns scooping the dispossessed, homeless and weak off of the streets. These people would be very unlikely to have the documents proving they were free and would be shipped off packaged as a slave, both Thomas and Wren Natsworthy fell victim of this false imprisonment.