“The U.S. government is hopelessly awash in secret information, and this gripping history describes how we got that way and lays out the dismal consequences…The author delivers a wild, page-turning ride packed with intelligence mistakes, embarrassing decisions, expensive failed weapons programs, and bizarre research that has ranged from the silly to the murderous….Yet more evidence, brilliantly delivered, of the extent of the U.S. government’s dysfunction.” –Kirkus

“A brilliant, deeply unsettling look at the history and inner workings of ‘the dark state.’ The number of things that truly must be kept secret is small. The vast amount of information classified by the government is simply a means of wielding enormous power without real oversight. Again and again, Connelly reveals, secrecy has been used to hide mistakes, avoid embarrassment, cover up incompetence, and mislead the public. At a time when federal agencies are increasingly classifying or destroying documents with historical significance, this book could not be more important. An inscription at the entrance to the National Archives says it best: ‘Eternal vigilance is the price of liberty.’ ” —Eric Schlosser, New York Times best-selling author of Command and Control

“In The Declassification Engine, Matthew Connelly provides an incisive, unexpected account of the history and practice of official secrecy, offering a glimpse into a world that truly exists in the shadows. By showing the corrosive effects of state secrecy, he successfully makes the case for a different attitude to public information.” —Anne Applebaum, New York Times best–selling author of Twilight of Democracy

“The Declassification Engine is an outstanding expose of the secrecy-industrial complex that is suffocating our democracy. Matthew Connelly describes in vivid detail how the dark state became rooted in our national-security institutions and provides common-sense prescriptions for restoring transparency.” —Craig Whitlock, New York Times best–selling author of The Afghanistan Papers

“A profoundly important work of scholarship, one that addresses core questions about American democracy and the challenges to the nation’s venerable tradition of open government. Connelly’s findings are deeply troubling but also hopeful, showing us how data science can be used to help us better understand the past and thereby point the path to a more enlightened future.” —Fredrik Logevall, Pulitzer Prize-winning author of Embers of War

“Matthew Connelly has played three essential roles in the struggle against government secrecy: advocate, archive-maker, and historian. In The Declassification Engine, he combines all three into an unforgettable account, one that is full of fresh and startling revelations that demonstrate how much of our own history has been kept hidden from us.” —Nicholas Lemann, author of Transaction Man: The Rise of the Deal and the Decline of the American Dream

“This is an absorbing account of the evolution of government secrecy, and an insightful exploration of the relationship between transparency, accountability, and self-government. At a moment when democratic renewal seems absolutely urgent, Connelly’s fascinating study could hardly be more relevant.” —Jameel Jaffer, director of the Knight First Amendment Institute at Columbia University, and former director of the ACLU’s Center for Democracy