U.S. Chess Master Bobby Fischer was issued an arrest warrant for playing a chess march in Yugoslavia.
Fischer was charged in 1992 with violating economic sanctions imposed on Yugoslavia. He came out of retirement to earn $5 million in a rematch against his old nemesis, Boris Spassky. Fischer never returned to the United States and eventually settled (and died) in Reykjavik after renunciating his American citizenship.
Fun Fact! During World War II, the Nazis came dangerously close to developing Plutonium, but used by America!