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A gang is a group of bandits, thieves, and other criminals with an internal organization which often claims control over a territory within a community. Throughout history, these illegal groups have been employed by the Templars and Assassins as occasional allies or henchmen in their war, especially when their conflict spills over into controlling the criminal underworld.
During the Renaissance and Reconquista, gangs were already around. In the early 16th century, the streets of Rome, Italy, were preyed upon by the Cento Occhi, while the countryside was plagued by the Followers of Romulus.  Meanwhile, Madrid in Spain was introduced to the brief presence of the Cien Ojos, before they ran afoul of the Templars.
Seven Years' War
Gangs provided intelligence reports, support and manpower to the Assassins, holding strategic positions from the British, spying on Templar movements, and supporting the French in naval and infantry combat. The gangs were often led personally by Assassins, acting either as ship captains or as leaders within gang hideouts. They also made heavy use of various gases, often storing them in large barrels, or using them in the form of grenades similar to the 16th-century Ottoman Assassins.
Gangs had multiple hideouts throughout New York, the northern Atlantic Ocean and the River Valley, harassing the populace and preventing businesses and homes from being renovated. When in control of an area, the gang members would hang large orange banners from buildings and clothes lines, some bearing the Assassin insignia, as well as marking graffiti on walls. Upon liberation from their control, these markers would go away, save for a few buildings owned by people without the proper money and resources to renovate the buildings themselves.
During the Victorian era, various gangs such as the Blighters were active around London, primarily paid off by the British Templars, one of whom controlled each of the major gangs in the city and ruled the entire city with an iron fist. In retaliation, Jacob and Evie Frye of the British Assassins formed the Rooks, from the remnants of the Clinkers, in order to take back the city through the utilization of organized crime.
Behind the scenes
The gangs in Assassin's Creed: Rogue were more akin to mercenaries than those found in later generations, as they had ships and behaved like an organized force like the British and French armies, respectively.
- Assassin's Creed: Brotherhood
- Assassin's Creed: Project Legacy
- Assassin's Creed: Rogue
- Assassin's Creed: Syndicate
- Assassin's Creed: Templars
- Assassin's Creed: Last Descendants – Locus
- Assassin's Creed: Rebellion