Mind control
Hunter and those who picked up the Chinese term used it to explain why, unlike in earlier wars, a relatively high percentage of American GIs defected to the enemy side after becoming prisoners-of-war. British radio operator Robert W. Ford and British Army Colonel James Carne also claimed that the Chinese subjected them to brainwashing techniques during their war-era imprisonment. The most prominent case in the U.S. was that of Frank Schwable, a prisoner in the war. While in custody, he confessed to having taken part in germ warfare.