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The [[tech]]s of [[Necromunda (planet)|Necromunda]], be it belong belonging to a distinctive [[tech clan]] or a specialised group withing a larger clan, often form collectives to protect themselves from exploitation by other groups. Such associations of protection and defence often mature into gangs that are as aggressive, in their own way, as any other in the hives. Tech gangs have a pool of skills which means that they can often trade for materials from the [[factory level]]s. They deal in drugs, chemicals and weapons, trading these goods for technological relics and rare raw materials scavenged from the [[underhive]].{{Fn|1}}