The 1943 BRUSA Agreement (Britain–United States of America agreement) was an agreement between the British and US governments to facilitate co-operation between the US War Department and the British Government Code and Cypher School (GC&CS). It followed the 1942 Holden Agreement.
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👉 1943 BRUSA Agreement in the context of UKUSA Agreement
The United Kingdom – United States of America Agreement (UKUSA, /juːkuːˈsɑː/ yoo-koo-SAH) is a multilateral agreement for cooperation in signals intelligence between Australia, Canada, New Zealand, the United Kingdom, and the United States. The alliance of intelligence operations is also known as the Five Eyes. In classification markings this is abbreviated as FVEY, with the individual countries being abbreviated as AUS, CAN, NZL, GBR, and USA, respectively.
Emerging from an informal agreement related to the 1941 Atlantic Charter, the secret treaty was renewed with the passage of the 1943 BRUSA Agreement, before being officially enacted on 5 March 1946 by the United Kingdom and the United States. In the following years, it was extended to encompass Canada, Australia, and New Zealand. Other countries, known as "third parties", such as West Germany, the Philippines, and several Nordic countries, also joined the UKUSA community in associate capacities, although they are not part of the mechanism for automatic sharing of intelligence that exists between the Five Eyes.