They are guards (though a load with some cardamine might be a good RP idea) of both the Outcasts/BLS' interests, BLS cardamine smugglers and all Outcast cardamine smugglers. A little bit like an unlawful version of the RepEx Security staff.
If you want to move cargo, though, become a Smuggler. When 4.84 is out I'll be reworking the Smugglers as a subdivision with Smuggler ID's.