They Live (John Carpenter, 1988)

From http://en.wikipedia.org/wiki/They_Live :

They Live is a 1988 film directed by John Carpenter, who also wrote the screenplay under the pseudonym "Frank Armitage." The movie is based on Ray Nelson's 1963 short story "Eight O’Clock in the Morning."

Part science fiction thriller and part dark comedy, the film echoed contemporary fears of a declining economy, within a culture of greed and conspicuous consumption common among Americans in the 1980s. In They Live, the ruling class within the monied elite are in fact aliens managing human social affairs through the use of a signal on top of the tv broadcast that is concealing their appearance and subliminal messages in Mass media.