Clan Orgaal is a branch of the ambitious ruling Clan Velderan. These clans seek to increase Tharashk’s influence across Khorvaire and to ensure Velderan’s ultimate dominance within the house. Velderan has no interest in the Gatekeepers or the cults, and the clan exploits their squabbles to weaken its rivals. The ruling clans pay little attention to the small, orc-dominated Orgaal, which allows Velderan to use it for covert activities. Orgaal could employ adventurers to sow discord among other clans or embark on missions that aid Velderan at the expense of its rivals.
Source: Dungeon 191, Eye on Eberron: The City of Zarash'ak
The Orgaal are an orc-majority clan, and given this people often forget they’re allied with Velderan; as such, the Veldokaa often use them as spies and observers.