7. Julius and Ethel Rosenberg (The Soviet Spies)
Everyone suspected to be a spy was pursued everywhere during the period of Communist and McCarthyism. These duo spies were caught when evidence came from Ethel’s brother against the family. This happened when the Federal Bureau of Investigation was questioning them in return for a less ruthless sentence.
This duo turned out to be one of the popular cases of foreigners acting as a spy on U.S intelligence. The Soviet spies later got arrested by the U.S. and were charged with conspiracy. They carried on by claiming not guilty. Later on, they were sent to prison and executed by an electric chair.