Highly Classified Manhattan Project Had More Than 1,500 “Leaks”

By Steven Aftergood
fas.org
8-21-14

     The Manhattan Project to develop the first atomic bomb during World War II was among the most highly classified and tightly secured programs ever undertaken by the U.S. government. Nevertheless, it generated more than 1,500 leak investigations involving unauthorized disclosures of classified Project information.

That remarkable fact is noted in the latest declassified volume of the official Manhattan District History (Volume 14, Intelligence & Security) that was approved for release and posted online by the Department of Energy last month.

In several respects, the Manhattan Project established the template for secret government programs during the Cold War (and after). It pioneered or refined the practices of compartmentalization of information, “black” budgets, cover and deception to conceal secret facilities, minimal notification to Congress, and more.

But wherever there are national security secrets, it seems that leaks and spies are not far behind.

During the course of the Manhattan Project, counterintelligence agents “handled more than 1,000 general subversive investigations, over 1,500 cases in which classified project information was transmitted to unauthorized persons, approximately 100 suspected espionage cases, and approximately 200 suspected sabotage cases,” according to the newly declassified history (at pp. S2-3).

Most of the 1,500 leak cases seem to have been inadvertent disclosures rather than deliberate releases to the news media of the contemporary sort. But they were diligently investigated nonetheless. “Complete security of information could be achieved only by following all leaks to their source.” . . .

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