The Shadow Broker are a group of spies and politicians from almost every space-faring species in the galaxy, excluding only the vorcha, the geth and the collectors. The group was started in the 18th human century by the Salarian Special Tasks Group as a way of expanding their espionage to all corners of the galaxy. Soon, however, the group went rogue and started to sell secrets about every faction in the galaxy to their rivals.
Though the group itself is common knowledge, its exact nature is a mystery. Only its highest members know whether the Shadow Broker is a group or an individual. These high members have been integrated into everyday life, usually in positions of power. The volus ambassador, for instance, is one of the most senior members of the group.