Branch, 1993. Rudner, Martin. "Canada's Communications Security Establishment: From the Cold War to Globalization", Intelligence and National Security. Volume 16 Number 1 (Spring 2001). 97–128. Whitaker, Reginald. "Cold War Alchemy: How America, Britain, and Canada Transformed Espionage into Subversion", Intelligence and National Security. External links UKUSA Agreement at The National Archives UKUSA Agreement Release 1940-1956 at the National Security Agency Top Level Telecommunications: Five Eyes, 9-Eyes and many more Kurt Opsahl, Electronic Frontier Foundation: It Always Feels Like the Five Eyes Are Watching You, 35C3, 2018-28-12. Anglosphere Espionage National Security Agency GCHQ Government databases in the United States Signals intelligence agencies Privacy of telecommunications United States national security policy Australia–United Kingdom relations Australia–United States relations Australia–New Zealand relations Australia–Canada relations Canada–United Kingdom relations Canada–United States relations Canada–New Zealand relations New Zealand–United Kingdom relations New Zealand–United States relations United Kingdom–United States treaties Treaties of Australia Treaties of Canada Secret treaties Treaties of New Zealand Treaties of the United Kingdom Treaties of the United States 1946 establishments in the United Kingdom 1946 establishments in the United States Treaties entered into force in 1946 1946 establishments in Canada Cold War history of Australia