I searched for this here but didn't come up with anything. This was reported back in May 21, 2002.
Apparently, an FBI agent who was on the Moussaoui case had concerns about other agents hampering the investigation. She wrote a letter to FBI director Robert Mueller regarding this.
Dear Director Mueller:
I feel at this point that I have to put my concerns in writing concerning the important topic of the FBI's response to evidence of terrorist activity in the United States prior to September 11th. The issues are fundamentally ones of INTEGRITY and go to the heart of the FBI's law enforcement mission and mandate.
Apparently, she felt this problem was deeply rooted in the FBI:
To get to the point, I have deep concerns that a delicate and subtle shading/skewing of facts by you and others at the highest levels of FBI management has occurred and is occurring.
One of her concerns regarding pre-9/11:
1) The Minneapolis agents who responded to the call about Moussaoui's flight training identified him as a terrorist threat from a very early point. The decision to take him into custody on August 15, 2001, on the INS "overstay" charge was a deliberate one to counter that threat and was based on the agents' reasonable suspicions.
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