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In page Zinoviev letter:

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These findings and allegations motivated the British Foreign Office to undertake a study of their own. For three years, Milicent Bagot of MI5 examined the archives and conducted interviews with surviving witnesses. She produced a long account of the affair, but the paper ultimately proved unpublishable because it contained sensitive operational and personnel information.[5] Nevertheless, Bagot's work proved important as a secondary source when the Foreign Office revisited the matter three decades later.[citation needed]