Library of Congress: The Library of Congress is the largest library in the world, with millions of books, films and video, audio recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.
National Archives:The National Archives and Records Administration is an independent agency of the United States government within the executive branch, charged with the preservation and documentation of government and historical records.
U.S. Department of Treasury: The Financial Crimes Enforcement Network (FinCEN), a division of the Dept. of Treasury, supports law enforcement investigative efforts and fosters interagency and global cooperation against domestic and international financial crimes. It also provides U.S. policy makers with strategic analyses of domestic and worldwide trends and patterns.
Other useful resources to help your research
FBI Records: The Vault: Organized Crime: This is a useful resource for the history of organized crime. You will also find information on some of the more famous (infamous) members of the mafia.
FBI: A Brief History: The FBI and the American Gangster, 1924-1938. On this site you will find interesting facts about the FBI amd "Famous Cases and Criminals."
Organized Crime and Gang Section (OCGS), The Criminal Division, U.S. Department of Justice: The Violent Crime and Racketeering Section (VICAR) within the Criminal Division was established in late 2010 as a merger of the (former) Organized Crime and Racketeering Section (OCRS), Gang Unit, and the National Gang Targeting, Enforcement & Coordination Center (GangTECC). The new, combined VICAR pursues a multi-faceted approach to combating all forms of organized crime targets.
Interpol: The Organized Crime unit works hand in hand with all of INTERPOL’s police services to identify major figures involved in transnational crime, the associated criminal networks and their activities.
Crime Museum: The Crime Museum opened in Washington, DC in 2008 as an educational resource on law enforcement, crime history, and forensic science, and a repository for artifacts on America’s favorite subject.