Why was it hard to begin a co-operation between the US and the British in the codebreaking section:

" The British were grappling with their own reservations about the Americans: " We are entitled to recall that America sent over at the end of the last war the now notorius Colonel Yardley for purposes of cooperation. He went so far as to publish the story of his cooperation in book form." Indeed, Herbert O. Yardley- ladies´man, high roller, and head of America´s codebreaking effort during WW1- had penned a memoir in 1931, the "American Black Chamber", that became a bestseller. In it, he detailed his success against enemy codes;later, he supplied the background for a Hollywood spy film."

From "Secret in building 26" by DeBrosse and Burke

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