The United States Central Intelligence Agency (CIA) has been accused of involvement in drug trafficking. Books and investigations on the subject that have received general notice include works by the historian Alfred McCoy, professor and diplomat Peter Dale Scott, journalists Gary Webb and Alexander Cockburn, and writer Larry Collins. These claims have led to investigations by the United States government, including hearings and reports by the United States House of Representatives, Senate, Department of Justice, and the CIA's Office of the Inspector General.