The casteless dwarves of Orzammar have few prospects. Consigned to live in a crumbling ruin on the social and economic fringes of the mighty dwarven capital, most resort to begging, prostitution, or crime.
Just as all rivers eventually join the sea, all casteless who turn to crime eventually become part of the Carta. The Hero of Ferelden decimated the ranks of this ancient gang while rallying the dwarves to join in the battle against the Archdemon Urthemiel. Unable to recover the power they once had in Orzammar, they turned their attention "topside," using groups of surface-dwelling dwarves to smuggle weapons, lyrium, surface luxuries, people, and other goods between Orzammar and human lands.
Despite the flow of business, its members are still desperate and violent. With no strong leader to rein in their excesses, they have little sense of dwarven honor, and freely break their word, double-cross allies, and renege on deals.