In David Fincher's series Mindhunter, what FBI unit do the main characters work in?

In David Fincher's series Mindhunter, the main characters work in the FBI's Behavioral Science Unit. The unit is based at the FBI Academy in Quantico, Virginia, and the series dramatizes its early work in criminal psychology and offender profiling.

The show's central investigators, Holden Ford and Bill Tench, interview imprisoned serial killers to identify behavioral patterns, motives, and investigative clues. Psychologist Wendy Carr joins their research effort, helping give the project a more academic and analytical dimension.

Mindhunter is set mainly in the late 1970s and early 1980s, when the FBI was developing systematic approaches to studying serial offenders. Its characters are fictionalized versions of real figures: Ford draws heavily on John E. Douglas, Tench on Robert Ressler, and Carr on researcher Ann Wolbert Burgess.

Viewers sometimes confuse the show's unit with the Behavioral Analysis Unit, the name more widely associated with modern FBI profiling dramas. Historically, the Behavioral Science Unit was the relevant name for the period depicted in Mindhunter, making it the precise answer.