The Internal Safeguards Division was a branch of the Galactic Empire. During the early portion of the Galactic Civil War, the ISD was known to use assassin droids alongside organic agents. Some sources suggested that one-third of all secret high-profile ISD arrests and eliminations were completed by assassin droids, although they were always accompanied by an agent. The use of assassin droids by the ISD in violation of the Empire's direct ban on their use was a source of debate; it was unknown if the ISD's use of assassin droids was officially sanctioned despite the ban, or if the ISD purposely flouted the regulations since they were reluctant to stop using them.
- The Star Wars Sourcebook
- Star Wars Sourcebook, Second Edition
- The Complete Star Wars Encyclopedia (As "Imperial Safeguards Division")