Assassin droids, also known as war droids, were a type of droid built specifically for the purpose of assassination. They were independently programmed, answering to no masters, but could be programmed to serve one or more masters. The company Holowan Laboratories produced a model of assassin droid known as the IG-86 sentinel droid, which were used as enforcers by criminal elements. Other assassin droids included the BT-1 assassin droids and 0-0-0 produced by the Galactic Empire's Tarkin Initiative, and the droid bounty hunters IG-88, IG-90, and IG-11. The Imperial Security Bureau and Imperial Army Intelligence utilized the E522 assassin droid for use of black op missions. The Rebel Alliance's Intelligence also later used it.
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