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Answer for the clue "Spying on the spies ", 16 letters:
counterespionage

Word definitions for counterespionage in dictionaries

WordNet Word definitions in WordNet
n. spying on the spies

Wiktionary Word definitions in Wiktionary
n. All those activities undertaken to neutralize or exploit the espionage activities of another nation or an enemy

Usage examples of counterespionage.

Torriti turned in a complete circle, as if he were winding himself up, then asked if Angleton was aware that Philby had signed out MI6 Source Books on the Soviet Union long before he became involved in Soviet counterespionage.

Different divisions of the Krypteria are tasked with foreign and domestic intelligence (in cooperation with the War Directorate), covert operations abroad, countersubversion and counterespionage.

The military academies added new courses such as cryptotactics, cryptocountering (that is, taking counterespionage to the nth power), crypto field theory, and finally cryptocryptics, the secret study of the secret use of secret weapons indistinguishable from natural phenomena.