The CIA has spent years denying that it created a file on Noam Chomsky, but an FOI request has now uncovered an FBI document referencing the CIA file. The CIA file was destroyed at some point, and it is not clear whether that was done in accordance with the Federal Records Act.

What's your citation for the claim that the CIA denied ever creating a file? All I see is denials that the file existed at the time of the FOIA requests, and nothing to suggest those denials were untruthful.