Mass Effect & Mass Effect 2
Salarian intelligence field agents are grouped into an organization called the Special Tasks Group. STG operations work in independent cells, performing dangerous missions such as counterterrorism, infiltration reconnaissance, assassination, and sabotage.
The STG is a proactive organization, puncturing worrisome trends before they become movements. At any time, a dozen groups are operating covertly within the lawless Terminus Systems, sowing dissent among the various factions. Civilian analysts also note how troublesome 'hinge point' individuals in Terminus frequently meet unexpected deaths.
STG operatives are feared throughout the galaxy for their clear-eyed, remorseless practicality. They are willing to do whatever it takes to achieve the mission, even if it kills civilians or results in the team's own destruction. In many ways, they are akin to the Council Spectres.
Recently, a number of STG cells have been redeployed from Salarian Union. It is assumed they are in the Terminus and Attican Traverse, investigating reports of geth activity beyond the Perseus Veil.