While Hoover and the FBI suspected the Fischer's of being communist agents, the KGB was just as concerned with Fischer. After the collapse of the Soviet Union, several documents revealing the level of concern over Fischer and his impact on the propaganda war were revealed from KGB files. There was an ongoing project within the Soviet intelligence service to discredit Fischer and to break his morale.
With two great world powers fighting a proxy war on his back, Fischer eventually lost his cool. He turned from American hero to American hater, while also remaining violently anti-communist. His anti-American rants were punctuated with high levels of anti-Semitism and paranoia, and he eventually became a recluse. When he came out of hiding to play a match in Yugoslavia, he violated US trade sanctions and became a fugitive, disappearing again only to surface later in Japan where he was arrested in 2004. He renounced his American citizenship and eventually became a citizen of Iceland where he died in 2005.
