The Chaos Squats

Chaos Squats are the armourers and artificers of the armies of Chaos. With devilish cunning they constantly construct weapons and engines of war which defy sanity. Each new creation is magnificently built to evoke the correct aura of terror and majesty. It is thought that Chaos Squats are responsible for the maintenance and reconstruction of Chaos Titans and the fearsome Artifact Weapons of Chaos. Chaos Squats fight with unparalleled ferocity on the field of battle, favouring heavy firepower to slaughter their foes.
Taken from WD 131

To the shame of the Squat race, there are many strongholds and Brotherhoods who have sided with Chaos. During the wars of the Horus Heresy, Squat forces fought on both sides, and inevitably some fell prey to the corruption of Chaos. Like the other followers of Horus, these have now largely been banished to the Eye of Terror, but there are always rumours of isolated groups of Chaos Squat raiders in various parts of the Imperium.
It has been rumoured that some of the strongholds which were lost to the warpstorms in the Age of Isolation may have survived, their horribly-mutated inhabitants raiding into the Imperium from time to time.
Taken from The White Dwarf Compendium

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