They haven't, and the FBI will do everything in its power to keep it that way. Because protecting the reputation of the Bureau is far more important than ensuring its integrity.
If you meant "how did they become known," it appears to be the result of an IG investigation into the FBI.
They haven’t, and the FBI will do everything in its power to keep it that way. Because protecting the reputation of the Bureau is far more important than ensuring its integrity.
Not to worry. The FBI’s reputation is secure as a corrupt, politicized, self serving bureaucracy.