Klaus Fuchs
Fuchs was one of the members of the team that worked on the Manhattan Project. He was one of the three men that were caught for "espionage activity" in Los Alamos. He was a Russian Spy, but while in the United States he worked on implosion problems and he sent some sketches of "Fat Man" back to his Russian Leader. Their was a two day trial in over to see if Fuchs was guilty of being a spy but he confessed and was convicted of espionage.