Review of Various Actions by the Federal Bureau of Investigation and Department of Justice in Advance of the 2016 Election [open pdf - 8MB]
"In response to requests from Congress, various organizations, and members of the public, the Department of Justice (Department) Office of the Inspector General (OIG) undertook this review of various actions by the Federal Bureau of Investigation (FBI) and the Department in connection with the investigation into former Secretary of State Hillary Clinton's use of a private email server. [...] During the course of the review, the OIG discovered text messages and instant messages between some FBI employees on the investigative team, conducted using FBI mobile devices and computers, that expressed statements of hostility toward then candidate Donald Trump and statements of support for then candidate Clinton. We also identified messaged that expressed opinions that were critical of the conduct and quality of the investigation. We included in our review an assessment of these messages and actions by the FBI employees."
Department of Justice, Office of the Inspector General, Report No. 18-04
U.S. Department of Justice: http://www.justice.gov/