What is the BSU?
The BSU, recently renamed to the ISU (Investigative Support Unit,) is a specialized unit within the FBI charged with providing, upon request, criminal profiles to law enforcement agencies. Profilers are specially-trained agents that can take the circumstances and situational specifics of a crime and “reverse-engineer” the type of person that would commit such a crime. For more information about the BSU/ISU, read “Mindwalker” by John Douglas.