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Eavesdropping on Hell: Historical Guide to Western Communications Intelligence and the Holocaust, 1939-1945 by Robert J. Hanyok

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Chapter 2. Overview of the Western Communications Intelligence System during World War II

During the Second World War, the United States and Great Britain operated the principal Western Allied code-breaking agencies. The Commonwealth countries of Canada, Australia, and New Zealand, and Britain's colony of India provided substantial support with personnel and material, especially in the Middle East, Pacific and Asia theaters of combat. There were lesser contributions from small European national detachments that had escaped from Poland, France, and the Netherlands East Indies. By war's end, this multinational effort had brought to a high-level of proficiency a worldwide system that intercepted, decrypted, translated, and disseminated intelligence ...

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