The Watch was the civil constabulary of Baldur's Gate who patrolled and protected the citizens of its Upper City. They were headquartered within the Watch Citadel, the grand keep that served as their logistical launch point and housed their training grounds,located in the appropriately named Citadel Streets district.
Unlike the Flaming Fist, who acted as soldiers and fought against threats both domestic and abroad, the Watch had limited authority and could not act outside the city proper.