A resolution on combatting âAmerican spies." The document calls for Public Security to re-interview all confirmed or suspected âCIAâ agents being held in re-education camps and to conduct careful reviews of the enormous volume of documents captured by Communist forces when they took over South Vietnam in 1975 in order to identify and arrest any âstay-behindâ agents of the Americans as well as former âCIAâ agents who had still managed to evade detection and arrest.