<extra-snark> The FBI had information within the organization itself and still fumbled the ball: http://www.washingtonpost.com/wp-dyn/content/article/2006/03...
<snark-doubledown> The CIA likely helped create Al Qaeda, so perhaps they were protecting their own. Or maybe they were too busy running drugs and plotting the overthrow of other governments to get the memo out. </snark-doubledown> </extra-snark>
Sorry, no love for any of these guys.
What sources would you recommend reading to learn more about that? The 9/11 Commission Report? I'm embarrassed to admit that I haven't done much reading on inter-agency relations pre-9/11.
(I hope this comment doesn't read as snark, I'm genuinely interested in learning more.)
For a general idea of what the book goes into, you can see Soufan's profile in the New Yorker: http://www.newyorker.com/archive/2006/07/10/060710fa_fact_wr.... In the (Pulitzer Prize-winning) reporter's own words: "Soufan became America’s best chance to stop the attacks of September 11th.".