The irony that emerges from the FBI files on Camus and Sartre, spanning several decades is that the G-men, initially so anti-philosophical, find themselves reluctantly philosophizing. They become (in GK Chesterton’s phrase) philosophical policemen.
Hoover needed to know if Existentialism and Absurdism were some kind of front for Communism. To him, everything was potentially a coded re-write of the Communist Manifesto. That was the thing about the Manifesto—it was not manifest: more often it was, as Freud would say, latent. Thus FBI agents were forced to become psychoanalysts and hermeneuts…Thus we find intelligence agents studying scholarly works and attending lectures.
But the FBI were “philosophical policemen” in a second sense: in tracking Camus and Sartre (surveillance, eavesdropping, wiretapping, theft) they give expression to their own brand of philosophical investigations. In particular, the FBI philosophy files reveal how the agency became so dogmatically anti-conspiratorial.