Bobby Fischer
Chess Grandmaster and the 11th World Chess Champion. After violating a ban on travel to Yugoslavia in 1992 he was indicted by the USA Court and forfeited his US citizenship. After several attempts to receive asylum in different countries he was finally granted Iceland citizenship.
Sources:
http://www.bloomberg.com/apps/news?pid=newsarchive&sid=amx21MqZzvxk,
http://usatoday30.usatoday.com/news/world/2004-08-24-fischer_x.htm.