In their book, "Fatal Hour: The Assassination of President Kennedy By Organized Crime", authors Richard N. Billings and G. Robert Blakey (who was chief counsel of the House Select Committee on Assassinations and previously Special Attorney in the Organized Crime and Racketeering Section of the Criminal Division of the U.S. Department of Justice under Attorney General Robert F. Kennedy) conclude that President Kennedy's murder was planned and carried out by Marcello and conspirators. They claim that their book lays out evidence that has been corroborated by additional sources and official records released in subsequent years.