In WWII, the U.S. stayed ahead of the Soviet Union in the race for atomic bombs, but the Soviets' genius for espionage allowed them to acquire atomic secrets of their own.
Learn about the history and reach of the Komitet Gosudarstvennoe Bezopasnosti (Committee for State Security), the agency of the former Soviet Union responsible for state security from 1954 to 1991.
One of the former Soviet Union's greatest espionage operations ended in 1951 when two young English diplomats at the British Foreign Office were revealed to have spent a decade funneling secrets to the KGB.
Examine the story of Japans’ elaborate espionage network, including the build-up to Pearl Harbor and beyond.
The French had a sophisticated intelligence network, which was active during WWI, confronted the Bolsheviks during the inter-war years, and has continued from World War II to today.
Britain's counter-espionage service proved highly effective during both World Wars but later faced criticism for failing to expose the Cambridge spies.
Take a look at the role played by intelligence-collection ships in all the major conflicts in the 20th century, from equipment transport to participation in international disputes.
Lenin’s feared secret police, the Russian Bolshevik Cheka knew no bounds and was run by the dreaded Feliks Dzershinsky, who founded the Gulag Archipelago.
Bletchley Park, an unassuming Victorian mansion 50 miles north of London, became the most potent deciphering center of WWII when its staff of code breakers cracked the Nazis' encrypting machine.
From the Zimmerman Telegram in 1917 through to recent breaking of Russian codes, many battles were won or lost because one side could read its opponent's intercepted messages.