Category
page 1Counterintelligence agencies

Abwehr
The '''' (; German for "resistance" or "defence", though the word usually means "counterintelligence" in a military context) was the German military-intelligence service for the Reichswehr and the Wehrmacht from 1920 to 1944. Although the 1919 Treaty of Versailles prohibited the Weimar Republic from establishing an intelligence organization of their own, they formed an espionage group in 1920 within the Ministry of Defence, calling it the Abwehr. The initial purpose of the Abwehr was defense against foreign espionage: an organizational role that later evolved considerably. Under General Kurt v

SMERSH
SMERSH () was an umbrella organization for three independent counter-intelligence agencies in the Red Army formed in late 1942 or even earlier, but officially announced only on 14 April 1943. The name SMERSH was coined by Joseph Stalin. The formal justification for its creation was to subvert the attempts by Nazi German forces to infiltrate the Red Army on the Eastern Front.
Australian Security Intelligence Organisation
Australian domestic intelligence agency
Military Counterintelligence Service
military counterintelligence and security agency in Germany
Counterintelligence Corps
intelligence agency within the United States Army (1941-1961)
Security Information Agency
national intelligence agency of Serbia
Secretariat of Intelligence of the State
Argentine intelligence agency

Servizio Informazioni Militari
military unit

State Security Service of the Republic of Azerbaijan
domestic intelligence agency and secret police
Estonian Internal Security Service
government agency of Estonia
Ministry of National Security of Azerbaijan
intelligence agency
U.S. Air Force Office of Special Investigations
US federal law enforcement agency that reports directly to the Secretary of the Air Force
Military counterintelligence of the Soviet Army

Shai
intelligence and counter-espionage arm of the Haganah
State Security Department of Lithuania
Lithuanian intelligence agency
Military Counterintelligence Service
intelligence agency in Poland
Federal Intelligence Agency
former intelligence agency of Argentina
Defense Counterintelligence and Security Agency
agency in the U.S. Department of Defense
Central Intelligence Organisation
national intelligence agency, Zimbabwe
Military Security Command of the Korean People's Army
military unit
Defense Security Support Command
military security service of South Korea
Military Security Agency
security and counterintelligence agency of the Serbian Armed Forces