Noun
counter-espionage (uncountable)
(especially in British English) Alternative form of counterespionage
Also monitoring foreign mail and acting as counter-espionage to help secure allied victory. citation On August 12, 1918, the Post Office Department took over airmail service from the United States Army Air Service (USAAS). Source: Internet
For a large sum of money, Volkov offered the names of three Soviet agents inside Britain, two of whom worked in the Foreign Office and a third who worked in counter-espionage in London. Source: Internet
It is entrusted with foreign and domestic espionage, counter-espionage, and state security. Source: Internet