"Double agent" is a counterintelligence term for someone who pretens to spy on a target organization on behalf of a controlling organization, but in fact is loyal to the target organization. Double agents may be agents of the target organization who infiltrate the controlling organization, or may be previously loyal agents of the controlling organization who have been captured and turned by the target; the threat of execution is the most common method of turning a captured agent into a double agent. Compare to defector.