The best situation is where they cast you and then they trust you.
The betrayal of trust carries a heavy taboo.
Let's say a Soviet exchange student back in the '70s would go back and tell...
Deciding whether to trust or credit a person is always an uncertain task.
Espionage for the most part involves finding a person who knows something...
They think they can make fuel from horse manure - now I don't know if your car will be able to get 30 miles to the gallon but it's sure gonna put a stop to siphoning.