The Stasi appears as an hostile faction in the Black Ops: Declassified Operation Active Measures as well as in the Hostiles mode. It is also an enemy faction in the Black Ops Cold War mission Brick in the Wall.
Call of Duty: Black Ops: Declassified[]
In Call of Duty: Black Ops: Declassified they appear exclusively in the mission Active Measures where they manage to successfully assassinate a Unnamed Stasi defector, however Alex Mason manages to gather intel from his corpse and the Stasi in the area are all killed from there Mason escapes by going into the Sewers however the Stasi attempt to stop him however they fail and Mason escapes. At the end of the mission two KGB operatives attempt to stop him but they fail two. The intel from the Defector had information on the KGB Colonel Mikhail Belov meaning he is probably associated with them.
