[gosub100]

> Certainly the US intelligence apparatus existed pre 9/11

yeah, the CIA was busy welcoming terrorists into the country [1], one of whom would get convicted of planning the 1993 WTC bombing:

"he tried to re-enter the U.S. in August 1991. At that point, U.S. officials recognized that he was on the lookout list, and began the procedure to revoke his permanent resident status. The U.S. government still allowed him to enter the country, as he had the right to appeal the decision to revoke his residency status. Abdel-Rahman failed to appeal the decision, and on 6 March 1992, the U.S. government revoked his green card. He then requested political asylum. A hearing on that matter was held on 20 January 1993.[14] It was later revealed that Abdel-Rahman was given most of his visa approvals by the CIA.[15] Egyptian officials have testified that the CIA was actively assisting him in entering the US.[16][17] The CIA also protected Abdel-Rahman after he arrived in the United States.[18]"

[1] https://en.wikipedia.org/wiki/Omar_Abdel-Rahman