armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"

counterspy, mole - a spy who works against enemy espionage

double agent - a spy who works for two mutually antagonistic countries

espionage agent - someone employed to spy on another country or business competitor

foreign agent - a spy for a foreign country

infiltrator - someone who takes up a position surreptitiously for the purpose of espionage

intelligence agent, intelligence officer, operative, secret agent - a person secretly employed in espionage for a government

sleeper - a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal

Margarete Gertrud Zelle, Mata Hari - Dutch dancer who was executed by the French as a German spy in World War I (1876-1917)