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FBI Index

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Through Cross-reference, World War II and Judicial review

General Intelligence Division

In 1919, during the First Red Scare, William J. Flynn of the Bureau of Investigation appointed J. Edgar Hoover chief of the General Intelligence Division (GID). Hoover used his experience working as a library clerk at the Library of Congress to create an index tracking system which used extensive cross-referencing.

The GID took files from the Bureau of Investigations (later renamed the Federal Bureau of Investigation) and 'systematized' them via index cards. The cards covered 150,000 people. By 1939, Hoover had more than 10 million people 'Indexed' in the FBI's domestic file system.

Although the GID was terminated in 1924 after objections from people such as William J. Donovan who questioned its constitutionality, Hoover and the FBI continued to expand the Index system for use by the agency, by Hoover, and by Hoover's political associates well into the 1970s. Presently, the Index files covering an unknown number of Americans are still accessible by the FBI and its 29 field offices.

Titles of the evolving Index catalogs include: the Custodial Index, which included citizens or aliens with German, Italian and Communist sympathies, that could be held in internment camps during World War II; the Security Index, for influential people to be "arrested and held" in case of a national emergency; The Communist Index; The Agitator Index; Sexual Deviant Index; and The Administrative Index, which compiled several earlier indexes.

Even though a complete list of Index titles is currently unavailable, Hoover and the FBI used their Index system to catalog Native American and African American liberation activists during the 1960s and 1970s, as well as Vietnam War protesters and some other college students.

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