FBI’s Colossal Fingerprint Filing System During World War II

These photos give us a rare look inside the FBI’s overflow filing system. The FBI’s archive collected over 23 million cards and 10 million fingerprint records, and housed them in the Washington, D.C. Armory, during World War II. They added around 400,000 new cards every month.

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The federal government invested huge resources to investigate potential defectors and spies during this time, .

By the end of 1943, the FBI employed around 13,000 people.

Since 1924, the FBI has been the single U.S. repository for fingerprints.