Collection includes information on all aspects of criminal activities handled by the U. S. Postal Inspection Service (including mail fraud, drug trafficking, bombs, child pornography, and identity theft) as well as criminal cases undertaken by the Inspection Service for other government agencies, particularly the Department of Justice. Some examples of these cases are the Robert Hanssen spy case, the Ruby Ridge and Waco cases, and the anthrax crisis of 2001.

This box contains information on the Terry family, the Todd family, the Tolley family, the Waddell family, the Walker family, the Walkup family, the Wallace family, the Wardlaw family, the Waskey family, the Weaver family, the Weir family, the Welch family, Ki Williams, the Willson/Wilson family, the Woods family, the Youel family, and Brian Young.