Hundreds of spies betrayed their countries during the Cold War, often motivated by ideology, or financial reward. Jeff Carney was different - he was a lonely, gay US airman who dreamed of a new life in East Germany. Years later, he sees parallels between his story and that of Chelsea, formerly Bradley, Manning.
It was the middle of the night in April 1983, when Jeff Carney approached Checkpoint Charlie. His steps grew shaky and he began to sweat.
As he stepped across the painted white line that separated East and West Berlin, he thought he was safe. He thought he was going to live in the east. He couldn't have been more wrong.
East German border guards took him to a small bare room with a cheap desk, a couple of chairs and a German-English dictionary.
"My intent when I went over that white line that night was not in any way to become a spy. My intent was simply to get away," he says.
"I requested to speak to representatives of the East German government and when they came to me they weren't just any representatives, they were the men in the leather jackets so to speak. They were spies."
