My mother used to take my brother and me to get any books we wanted, but they were second hand books published in the '30s and '40s. I liked scary books. ↗
Let's say a Soviet exchange student back in the '70s would go back and tell the KGB about people and places and things that he'd seen and done and been involved with. This is not really espionage; there's no betrayal of trust. ↗
The difficulties of conducting espionage against the Soviet Union in the Soviet Union were such that historically the Agency had backed away from the task. ↗