FBI Index

The FBI Indexes, or Index List, was a system used to track American citizens and other people by the Federal Bureau of Investigation (FBI) before the adoption of computerized databases. The Index List was originally made of paper index cards, first compiled by J. Edgar Hoover at the Bureau of Investigations before he was appointed director of the FBI. The Index List was used to track U.S. citizens and others believed by the FBI to be dangerous to national security, and was subdivided into various divisions which generally were rated based on different classes of danger the subject was thought to represent.^[1]