Given that Ray Bradbury's novella The Fireman (which would eventually become Fahrenheit 451) was written in response to the McCarthy HUAC hearings, it might not be a surprise to learn that the FBI kept a file on him. The contents of that file have been released under the FOIA, and shows that the FBI apparently held a dim view of science fiction, since it could "frighten the people into a state of paralysis or psychological incompetence bordering on hysteria which would make it very possible to conduct a Third World War in which the American people would seriously believe could not be won..." [emphasis mine]. (via).
And how much better to die in all the happy period of undisillusioned youth, to go out in a blaze of light, than to have your body worn out and old and illusions shattered.
A FOIA request for Ernest Hemingway's FBI file has revealed that J. Edgar Hoover had placed him under surveillance due to his activities in Cuba. His fear that the FBI was spying on him was previously viewed as a consequence of the mental deterioration that eventually lead to his suicide.