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In page Zinoviev letter:
"In 2011, Jonathan Pile published his book Churchill's Secret Enemy, detailing the mysterious career of Sir George Joseph Ball. Pile accessed Ball's papers (most of which Ball had attempted to destroy) from the Bodleian Library, along with other newly available sources. Pile's thesis, explained in the book, is that the Zinoviev letter was likely composed by Ball (at the time a long-serving MI5 officer) and his cohorts.[citation needed]
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