Betrayal: Whitey Bulger and the FBI Agent Who Fought to Bring Him Down is the memoir of Robert Fitzpatrick, a former assistant special agent in charge of the FBI’s Boston office.

It was written by Fitzpatrick and his co-author Jon Land.

In the early 1980s, FBI headquarters in Washington sent Fitzpatrick to the Boston FBI office to evaluate Whitey Bulger's "suitability" as a high level informant.

Instead he encountered an environment that appeared to support and enable Bulger's alleged antithetical behaviors and goals.

[1][2][3] Former FBI Assistant Special Agent in Charge Sentenced for Perjury and Obstruction of Justice During Bulger Trial https://www.justice.gov/usao-ma/pr/former-fbi-assistant-special-agent-charge-sentenced-perjury-and-obstruction-justice