Lord's Resistance Army (LRA)

Los Alamos National Laboratory

Loyalist Volunteer Force (LVF)

Mail Sanitization

Malicious Data

Manhattan Project

Mapping Technology

Marine Mammal Program

McCarthyism

Measurement and Signatures Intelligence (MASINT)

Metal Detectors

Meteorology and Weather Alteration

Mexico, Intelligence and Security

MI5 (British Security Service)

MI6 (British Secret Intelligence Service)

Microbiology: Applications to Espionage, Intelligence, and Security

Microchip

Microfilms

Microphones

Microscopes

Microwave Weaponry, High Power (HPM)

Middle East, Modern U.S. Security Policy and Interventions

Military Police, United States

MOAB (Massive Ordnance Air Burst Bomb)

Molecular Biology: Applications to Espionage, Intelligence, and Security

Moles

Monroe Doctrine

Morocco, Intelligence and Security

Mossad

Motion Sensors