“On July 10 [2001], Special Agent Ken Williams of the FBI’s Squad Five in Phoenix issued the now-famous ‘Phoenix Memo,’ warning of ‘the possibility of a coordinated effort by Osama bin Laden to send students to the United States to attend civil aviation universities and colleges.’ The memo, titled ‘Zakaria Mustapha Soubra,’ suggested that the FBI should ‘accumulate a listing of civil aviation universities/colleges around the country’ and ‘consider’ seeking the authority to search visa records of Islamic students attending the flight schools.”
– Peter Lance, Triple Cross, Page 368