By 1942 the FBI was adding 400,000 file cards a month to its archives, and were receiving 110,000 requests for “name checks” per month. By 1944 the agency contained some 23 million card records, as well as 10 million fingerprint records. Around the war, the federal government invested huge resources into the FBI to investigate potential defectors and spies. President Roosevelt, for one, was concerned about the lure of Communism and the subsequent threat to democracy. By the end of 1943, the FBI employed around 13,000 people.
Computers were first installed to search these files in 1980. Since 1999, the FBI has stored and accessed its fingerprint database via the digital IAFIS (Integrated Automated Fingerprint Identification System), which currently holds the fingerprints and criminal records of over 51 million criminal record subjects and over 1.5 million civil (non-criminal) fingerprint records. US Visit currently holds a repository of the fingerprints of over 50 million non-US citizens, primarily in the form of two-finger records.