How does one research intelligence agencies like the GCHQ or the NSA? Historians and intelligence scholars Sarah Mainwaring and Professor Richard J. Aldrich know their fare-share about the pitfalls of writing about signals intelligence (SIGINT) and are not afraid to admit they had to find ‘creative’ ways of acquiring secret information. In this bonus, they share their researcher’s tips and tricks and explain the relationship between imperialism and intelligence.

Cover-art photo: by Sarah Mainwaring, from the UK National Archives, Kew, London

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