During the Korean War, many U. S. prisoners of war were held in war camps run by Chinese communists. Without using brutality, the captors secured the prisoners' collaboration in various activities. Some did simple tasks to gain privileges while others completed radio appeals and false confessions or divulged military information. When the war ended, 21 prisoners chose to stay with the communists. More returned home convinced that communism was a good thing for Asia. The Chinese captors were able to accomplish this by using: