FBI

From 9/11 Encyclopedia:

The Federal Bureau of Investigation was created in 1908 by the Justice Department. One of their most controversial parts of their history was, when J. Edgar Hoover (1924-1972) tried to turn the FBI into an orwellian database, when he okayed COINTELPRO (->) in the late 60s. Former G-Men George Wackenhut created Wackenhut Securities, which included a lot of former FBI-agents. Since the late 90s the FBI was corrupted by new concepts as in their "Division5", "National Police Force" and now as an arm of the Homeland Security. 

The FBI claimed, that it was incompetence of their office, who led to September 11th. It speaks for the FBI that one of their agents, John O'Neill was almost able to prevent the attack, but his story had never really been told for the public. O' Neill knew since 1998 about an ENRON-Taliban business deal. The majority of 911 Skeptics think, that the FBI was corrupted, sabotaged and manipulated by the CIA during the last 3 years. 
http://www.fbi.gov/ fbi.gov/terrorinfo/terrorism.htm 
fbi.gov/mostwant/terrorists/fugitives.htm
ifccfbi.gov/complaint/terrorist.asp

(See FBI Agents Died In Wtc) (See Fbi Alert On 19 New Suspects InDec 2002) (See Fbihq) (See Fbi-Watchlist) 

Most important other cross referrences: (-> 5th plane, 911-Hearings, Renee Adorna, Omar Al-Bayoumi, Saeed Alghamdi, Al-Jazeera US-Website shutdown, Nabil Almarabh, Mustafa Ahmed al-Hawsawi aka Sheikh Saeed, Nawaf al-Hazmi, Khalid al-Mihdhar, Andersen Consulting, Anthrax, Anthrax-911 Gate, Arab-American Institute, Aramark,Walid Arkeh, John Ashcroft, Atta, Benevolence International Foundation (Robert Walker), Bin Laden relatives,Barbara Bodine, BoozAllen & Hamilton (Dale Watson), Boston-connection, Bristol Meyers Squibb (Thomas Pickard), Agus Budiman (Jesus Gomez), Adnan Bukhari, George Bush, Carnivore , Chicago-Connection, CIA-cable, Richard Clarke, Aukai Collins (Andres Sanchez), Dallah Avco, Death Cases, Department of Justice, Dyncorp, Early warnings, ENRON-Taliban-connection, FAA-warnings, Flight 93-investigation (Wally Miller ->Konformist.com), Magic Lantern, David Frasca, Dark Winter, Stephen Hatfill, Jerome Hauer, Abdallah Higazi (Michael Templeton, Ronald Ferry), Hijacker ID-confusion (Bill Gore),Hijackers Gas,Hijackers- US Air Base connections, Informants, Dr. Thomas Inglesby / Dr. Tsonas, Insider-Trading 9/11 FBI / Christy Sarkey, Blocked Investigations, Jarrahs ticket ignored, Johns Hopkins Institute (FBI-John Collingwood), KPMG Consulting (Robert J. Chiaradio, James Kallstrom) , Michael Kennedy (Phoenix memo), Lawsuits (Flight 93/Bill Crowley), Khalid Bin-Mahfouz, Barry Mawn, MBNA Corp (Lewis Schiliro, Louis Freeh), Monterey Language Institute (Ali al-Ahmed), Moussaoui (FBI Yazid Sufaat report), Moving Systems, Richard Mueller, New Jersey Connection, New Zealand, Abdullah Noman/Glenn A Fine/Henry Falkowsky, Phoenix-memo, Thomas Pickard, Tyrone Powers, Ptech, Lotfi Raissi, Dave Rapp, Resignments, RISSNET, Dana Rohrabacher, Colleen Rowley, Saudi Arabia, David Schippers, Scripting Terror Alerts, Katherine Smith /J. Suzanne Nash,SSI,Yazit Sufaat,USS Cole,Virginia Connection,WAMY, War was planned,Dale Watson,Westin Hotel,Don C Wiley, Kenneth Williams, Robert Wright, Abu Zubaydah)