The Book of Judgement is the most recent supplement for Necromunda, covering law and disorder in the hives. One of the most fun elements is the coverage given to criminal alliances, allowing you to ally your gang with a criminal enterprise. In return for setting foot on the wrong side of the law, you gain the occasional help of your allies on the tabletop.
Cold Traders caught my eye the most - smugglers of off-world goods and exotic xenos artefacts. They are represented in-game by a smuggler shore-party, comprising a Cold Trader and his bodyguard.