When an organization, particularly ones that grant a lot of personal power to its agents, have a dedicated unit specialized in hunting down and executing its rogue or just unreliable members. Note that since the existence of such as a unit would be demoralizing to everyone else, it is usually held secret, so its reveal can be a major spoiler to the audience.
Compare Internal Affairs (who usually just investigate rogue elements, without the summary execution part), Secret Police (a clandestine government agency investigating and often eliminating threats to the state), Hunter of Their Own Kind (where the hunter is usually a former member of the group) and The Political Officer (who may be portrayed as this trope, but is often also in charge of general morale).
- The eponymous warriors in Claymore run a constant risk of Awakening into giant rampaging monsters, so sending warrior teams to kill their Awakened comrades is a normal thing for the Organization. What most warriors don't know, however, is that the Organization also has Number 10 (nominally the 10th strongest warrior of each generation) specifically trained to disable and to kill un-Awakened warriors, in case they turn on the Organization.
- Kenny Ackermann's Anti-Personnel Control Squad in Attack on Titan was formed in secret, (officially) to counter the Survey Corps in case they ever turned their attention from the Titans to internal politics. Like the Survey Corps, Ackermann's Squad is trained in the use of vertical maneuvering gear, giving them incredible mobility in urban warfare; unlike the Survey Corps, who are only equipped with anti-Titan swords, they have long-range handguns that are specifically designed to kill humans.
- According to the liner notes in Ghost in the Shell, Section 6 is the only government organization who has the authority to put out kill orders on members of other Sections. When Section 9 learns that Section 6 put out a hit on the Major, Chief Aramaki rushes to their headquarters and threatens to shoot Section 6's leader at point blank unless he calls off the hit. The hit itself was part of shady deal to nab a wanted foreign general who was too well protected from official due process.
- In Rurouni Kenshin, a comment from Kenshin implies that Saito, in addition to his duties as one of the captains of The Shinsengumi, was also tasked with ferreting out and killing rogue members.
- The Transformers (IDW): The Decepticon Justice Division is a super-elite force of Decepticons who hunt down and kill any of those within the Decepticon ranks who need to be put down. Traitors, moles, deserters, basically anyone for whom Treachery Is a Special Kind of Evil may apply.
- The Boys:
- The Mega-Corp Vought American is responsible for nearly everyone with superpowers, and uses The Seven (a takeoff on the Justice League) to police the rest. Most supers live a life of Sex Drugs And Rock N Roll, and that's fine, but if they start doing anything that might make Vought look bad in ways their enormous political and financial clout can't bury or explain away, then The Seven get sicced on whoever isn't behaving. The result is often very, very disturbing.
- The most powerful member of The Seven is Superman Substitute The Homelander, who was raised from birth by Vought to be their greatest star and the company's biggest showpiece, but they also realized the potential danger of someone with his powers going rogue, so they created a clone of him with augmented powers that could take him down in an emergency: Black Noir. The trope then gets deconstructed, as it's Noir who goes rogue. Turns out that being created for a single purpose and then being unable to fulfill it for decades does bad things to a person's mind, so Noir eventually instigated/provoked Homelander into a mental breakdown and a series of actions with world changing consequences.
- Double Team: Each member of "The Colony" has his own "overseer", one of the other retired spies that has the secret assignment to hunt down his respective member if he ever manages to escape. This is one of the complications that comes to bite Quinn in the ass when he does so on the third act, but thankfully his overseer happens to be a Reasonable Authority Figure and only asks Quinn for some hair so he can help him fake his death.
- In The Fifth Season, the Functional Magic of orogeny is a capital crime for everyone except members of the Fulcrum, which is nominally run by Imperial orogenes. Behind them are the Guardians: ageless Mage Killers with innate Anti-Magic and strange powers who forcibly recruit "feral" orogenes and kill Fulcrum orogenes who overstep their bounds.
- In Mother Night, one of Howard Campbell's guards is a Hungarian Jew who got forged papers, joined a Hungarian SS unit, and was assigned to one of these to find out who was leaking information to the Jews (it was himself). He notes with pride that 14 SS men were shot on his recommendations.
- Warhammer 40,000:
- The Space Wolves were originally the Emperor's executioners, being the ones who would take down their brother Space Marines if they went rogue. Leman Russ eventually changed their doctrine, leading to the more familiar "Horny Vikings IN SPACE!" theme. The role of anti-Space Marines Space Marines seems to have gone to the Minotaurs chapter, which answers only to the Inquisition.
- There is also the Ordo Sicarius, whose specific role is to monitor and if necessary eliminate members of the Officio Assassinorum, the official state assassins of the Imperium. They assassinate assassins...
- Most of the Successor States in Battletech have an organization that handles such affairs. The ISF (Internal Security Force) of the Draconis Combine, which is known for the amount of Jurisdiction Friction it has with the Combine's other special security force, DEST (Draconis Elite Strike Teams) used to be an agency that wasn't officially acknowledged until the Clans invaded. The Capellan Confederation has the Maskirovka, a secret police force that's feared for its ability to make enemies of the Celestial Throne disappear.
- Transformers: The Cobalt Sentries are part of the Decepticon Secret Police, who wield unlimited power to weed out traitors to the Decepticon cause within its ranks.
- BIONICLE: The Dark Hunter Eliminator has the role of eliminating incompetent Dark Hunters and completing their missions. Because of this, he is despised by his fellow Dark Hunters and The Shadowed One keeps away from the island of Odina, where the organization's headquarters is, to prevent attempts on Eliminator's life.
- The Executioner (E) units in NieR: Automata are a secret production line of YoRHa androids deployed by the Bunker to hunt down and to execute rogue agents like A2, or to keep a close eye on unreliable elements and to summarily execute them if necessary, like 2E was keeping tabs on 9S...
- Christine Royce from Fallout: New Vegas DLC Dead Money is a member of the Circle of Steel, a hardline faction within the Brotherhood of Steel who task themselves with assassinating those who betray the Brotherhood or stray too far from its core tenets.
- BlazBlue: The Zero Squadron is this for the NOL's army unit. It's an unofficial part of the army and answers directly to the Imperator. Their main duty is to look for and hunt any rogue members of the army, and kill them if needed.
- The Belkan Air Force in Ace Combat Zero: The Belkan War has the Schwarze Squadron, an eight man-team flying high-tech interceptor aircraft on standing orders to shoot down any Belkan aircraft attempting to defect. The player gets to engage them in the Mercenary route while they are chasing after Wolfgang Buchner, a.k.a. Pops from the previous game, as he attempts to cross over to Osea.