Even I find it hard to believe that people would do things like this. One of Le' Carre's novels "Russia house" has the plot where the protagonist co-operates wi

Even I find it hard to believe that people would do things like this. One of Le' Carre's novels "Russia house" has the plot where the protagonist co-operates with intelligence agency and in the other novel "Spy who came in from Cold" (one of the protagonist is tricked and unknowingly does the spying). Given his novels mirrored to a great extent how the intelligence agencies worked, probably this was not an uncommon tactic used by intelligence agencies.