"Conspiracy theories have frequently thrown suspicion on our organization, for example by falsely alleging that Lee Harvey Oswald worked for us. ... Addresses are requested ... to employ propaganda assets to ... refute the attacks of the critics. ... Our ploy should point out, as applicable, that the critics are (I) wedded to theories adopted before the evidence was in, (II) politically interested, (III) financially interested, (IV) hasty and inaccurate in their research, or (V) infatuated with their own theories."
January 1, 1970
https://en.wikiquote.org/wiki/Conspiracy_theories