Graham Greene's 1943 novel Ministry of Fear (brought to the big screen by Fritz Lang in 1944) combines all the ingredients of paranoia and conspiracy familiar to aficionados of the 1970s thrillers, with additional urgency and depth added by its wartime backdrop.
American novelist Richard Condon wrote a number of conspiracy thrillers, including the seminal The Manchurian Candidate (1959), and Winter Kills, which was made into a film by William Richert in 1979.
Gravity's Rainbow also draws heavily on conspiracy theory in describing the motives and operations of the Phoebus cartel as well as the development of ballistic missiles during World War II.
John Macgregor's 1986 novel Propinquity describes an attempt by a modern couple to revive the frozen body of a gnostic medieval Queen, buried deep under Westminster Abbey.
Philip K. Dick wrote a large number of short stories where vast conspiracies were employed (usually by an oppressive government or other hostile powers) to keep common people under control or enforce a given agenda.
The first season of the 1966 television series Star Trek includes an episode wherein a crewman fakes his own death and frames Captain Kirk for being responsible through criminal negligence to get him court-martialed whilst simultaneously tampering with the (seemingly infallible) Enterprise computer to ensure conviction.
In 2008, J. J. Abrams created a television series Fringe which is about an FBI agent, a brilliant scientist and his estranged son investigates unexplained cases related to government conspiracy and a parallel universe.
The 2013 series The Blacklist centres on an elusive criminal mastermind who strikes a deal with the FBI in an effort to take down the secret Cabal that framed him whose members include the Attorney General, Secretary of State and National Security advisor.