There are numerous conspiracy theories surrounding the assassination of John F. Kennedy on November 22, 1963. These theories posit that the assassination involved people or organizations other than Lee Harvey Oswald. Most current theories put forth a criminal conspiracy involving parties as varied as the CIA, the Mafia, sitting Vice President Lyndon B. Johnson, Cuban President Fidel Castro, the KGB, or some combination of those entities. Some conspiracy theories claim that the United States government covered up crucial information in the aftermath of the assassination. No single theory is widely accepted.