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When the United States joined the war, Churchill and Roosevelt agreed to pool resources.
A number of American cryptographers were posted to Bletchley Park and were inducted and then integrated into the Ultra structure, being stationed in Hut 3.
From May 1943 onwards there was very close cooperation between the British and American military intelligence organisations.
Conversely, the existence of Bletchley Park, and of the decrypting achievements there, was never officially shared with the Soviet Union, whose war effort would have greatly benefited from regular decrypting of German messages relating to the Eastern Front.
This reflected Churchill's concern with security, and his distrust of and hostility to communism, even during the alliance imposed on him by the Nazi threat.

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