Wacky details from chess champion Bobby Fischer's FBI files were released. Story here. The FBI suspected that the commies tried to recruit him. His mother's husband was named Fischer, but he wasn't really Bobby father. Bobby has made anti-jewish remarks, and both of his real parents were jewish. His mother was paranoid, but the FBI really was spying on her.

It all sounds ridiculous, but Fischer eventually did become strongly anti-American. Maybe the FBI was right that he was a traitor in the making.