counterespionage
coun-ter-es-pi-o-nage
noun
Activities undertaken by a nation to prevent or thwart enemy espionage within its borders.
"MI5 conducts counterespionage to protect national security."
coun-ter-es-pi-o-nage
Activities undertaken by a nation to prevent or thwart enemy espionage within its borders.
"MI5 conducts counterespionage to protect national security."