At some point during the Empire's reign, Ysanne Isard served as the Security Director of Internal Security.
The Internal Security Branch was first mentioned in Imperial Sourcebook. The 2003 "Coruscant: Center of the Empire" states that Internal Security was a part of the ISB, although the Imperial Sourcebook states that the ISB was an abbreviation of the Imperial Security Bureau, which it establishes to be a rival organization of the Internal Security Branch's affiliated organization, Imperial Intelligence.
The Internal Security Branch was first mentioned in Imperial Sourcebook. The 2003 "Coruscant: Center of the Empire" states that Internal Security was a part of the ISB, although the Imperial Sourcebook states that the ISB was an abbreviation of the Imperial Security Bureau, which it establishes to be a rival organization of the Internal Security Branch's affiliated organization, Imperial Intelligence.
- Imperial Sourcebook
- Dark Force Rising Sourcebook
- Imperial Sourcebook, Second Edition
- "The Pentastar Alignment" — Star Wars Adventure Journal 3
- The Thrawn Trilogy Sourcebook
- Stock Ships
- "Tasariq: The Crystal Planet" — Star Wars Adventure Journal 15
- The Complete Star Wars Encyclopedia
- Rebellion Era Campaign Guide