Others throughout the 1990s and into the 2000s failed to act not just CIA personnel.
Peter Lance's book, TRIPLE CROSS: How bin Ladens Master Spy Penetrated the CIA, the Green Berets, and the FBI - and Why Patrick Fitzgerald Failed to Stop Him, names them.
He has the best explanation why 9/11 happened: virtually all personnel in key positions were busy covering their butts for one goof-up after another. Simple as that as best I can understand it from his interviews. I've heard several including a couple of three-hour interviews.
Some terrorist connections were ignored because to act on them would jeopardize other cases. LE personnel who pushed the terrorist threat too hard were screwed. Lots of actionable shenanigans IMO.
I did not buy the book, Mr. Lance in his interviews was too quick to blame "Bush 1" and "Bush 2" while, when pressed, acknowledging that "President Clinton" is partly to blame.
Nevertheless, Mr. Lance documents events throughout the 1990s that were practically screaming, "Hey! over here, over here!" But alas. . . .
ah, but the stock market was so great......( except for me I guess)..