Federal Bureau of Investigation Electronic Reading Room - The VaultFBI files contain documents on espionage, famous persons, gangsters, unusual phenomena, violent crime and historical interest. The quality of these copies is often poor, because the original files are in fragile condition. These are the best reproductions available. Portions of the documents have been marked out. The deletions are made, in general terms, to protect national security, personal privacy interests, the identity of confidential sources, and law enforcement techniques.