His latest, just published, Medusa File II, consists essentially of his voluminous files of the investigation of the bombing of the Alfred P. Murrah Federal Building in Oklahoma City on April 19th, 1995, known as "the Oklahoma City Bombing." https://www.amazon.com/Medusa-File-II-Politics-Oklahoma/dp/1547027843/ref=sr_1_2?s=books&ie=UTF8&qid=1503780098&sr=1-2&keywords=Craig+Roberts
The FBI, appreciative of Roberts' capabilities, requested his service in the investigation. As officially part of the investigation, he took the investigation seriously. The investigation proceeded rapidly, developing many leads. Numerous witnesses saw Timothy McVeigh with many dark complexioned men prior to and just after the bombing. Leads were also developed to militias in Elohim City, to the German, Strassmeir, and others.
Before any of these leads could be developed, the investigation was taken over by President Bill Clinton's Attorney General, Janet Reno. Once Washington took over, the investigation stopped. In its place was Washington's theory that it was Tim McVeigh's lonely protest. The volumnious evidence of McVeigh's accomplices or controllers, as might have been the case, was in the way of the official story that imposed itself on the investigation. Many people resisted the coverup that descended on the case, including local journalists who eventually lost their jobs or moved on.