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Off the top of my head, I recall that Colleen Rowley was an FBI whistleblower who became Time's woman of the year in 2002, iirc. One of the things she blew the whistle on was the FBI's refusal to coordinate intelligence among disparate reports of Arab men taking flying lessons and also the huge obstruction that took place when Moussaoui was detained in MN.
Her testimony at the 9/11 Commission was marginalized. See also: Edmonds, Sibel, for much more scintillating stories.