It seems that Ray Bradbury, a vocal critic of Joe McCarthy and his ilk, was the subject of two FBI investigations in the 1950s. The Daily Beast has recently obtained the FBI files via a Freedom of Information Act request:
The FBI’s investigation of Bradbury in the late 1950s centers on alleged communist activity, and it reveals more about the author’s talent for holding up a dystopian mirror to reflect society’s flaws than actual communist tendencies. These government documents were first obtained by Bradbury biographer Sam Weller and described in his 2005 book The Bradbury Chronicles.
“I remember distinctly his response when I visited him and presented him with the files,” Weller told The Daily Beast. “He beamed ear to ear and dismissed it with a wave of his hand and laughed and he said, ‘I’ll be damned, I’ve had nothing to hide over the years—what are they going to investigate?