" During the Korean War, many captured American soldiers found themselves in prisoner-of-war (POW) camps run by the Chinese Communists. It became clear early in the conflict that the Chinese treated captives quite differently than did their allies, the North Koreans, who favored savagery and harsh punishment to gain compliance. Specifically avoiding the appearance of brutality, the Red Chinese engaged in what they termed their “lenient policy,” which was in reality a concerted and sophisticated psychological assault on their captives. After the war, American psychologists questioned the returning prisoners intensively to determine what had occurred. The intensive psychological investigation took place, in part, because of the unsettling success of some aspects of the Chinese program. For example, the Chinese were very effective in getting Americans to inform on one another, in striking contrast to the behavior of American POWs in World War II. "
― Robert B. Cialdini , Influence: The Psychology of Persuasion