In response to a FOIA request, the CIA has invoked Glomar and refuses to confirm or deny the existence of any records pertaining to Christopher Hitchens.
I honestly suspect there are some records due to his past associations with communists and just the global nature of his work, fame, and persona. I am willing to wage a modicum of my meager wage that we will have some confirmation of this when the FBI responds to FOIA requests seeking Bureau records on Hitchens.