
In Canon[]
The Tribes are three factions that have formed in the lower decks in the absence of any meaningful leadership from Captain Zedek. They are the mystery-meat cooking Beef Kings, the death-cult of the Prometheum Huffers, and the part-helpful, part insurrectionist Ga-Mu's Debuggers. They are currently in constant war with each other over the ownership of Tater Tot.

An accurate description of the event by The-Falling-Eagle
In Real Life[]
The Tribes of the Debt Collector is a series of living campaigns where viewers can influence the events of the show by playing 40k (8th, 9th, and Killteam) and reporting their results. The overview, rules, and FAQs of the campaigns can be found here, and participants will need to join ZoranTheBear's discord, which can be found here.