The C.I.A., it seems, was worried that the public might be too influenced by Orwell's pox-on-both-their-houses critique of the capitalist humans and Communist pigs. So after his death in 1950, agents were dispatched (by none other than E. Howard Hunt, later of Watergate fame) to buy the film rights to "Animal Farm" from his widow to make its message more overtly anti-Communist.
The agency also changed the ending of the movie version of "1984," disregarding Orwell's specific instructions that the story not be altered. In the book, the protagonist, Winston Smith, is entirely defeated by the nightmarish totalitarian regime. In the very last line, Orwell writes of Winston, "He loved Big Brother." In the movie, Winston and his lover, Julia, are gunned down after Winston defiantly shouts: "Down with Big Brother!"
You just can't make this up, can you. The boys in Langley must have been very proud. Altering 1984.
How the C.I.A. Played Dirty Tricks With Our Culture
(via Telepolis, in German, about European left-wing artist paid by the CIA)