They are the domestic cousins of foreign intelligence agencies, and typically conduct counterintelligence to thwart other countries' foreign intelligence efforts.
en.wikipedia.org He continued to provide counterintelligence and military information.
en.wikipedia.org This corps receives training, education, and work experience in information, intelligence, counterintelligence, human-derived information, networks, space, and oceanographic disciplines.
en.wikipedia.org Required in all cases and shall be conducted by trained security, investigative, or counterintelligence personnel to ensure full investigative coverage.
en.wikipedia.org States where the secret police wield significant power are sometimes referred to as police states or counterintelligence states.
en.wikipedia.org