image credit: http://www.pictureshowman.com/articles_genhist_censorship.cfm
It is the reason why you see the above screen in theaters at every movie you go to. Their review decisions are made in secret, infuriating film makers, who are given little to no information about why a film has been given a particular rating. The appeals process allows no documentation or recordings, and produces no written judgments, and is a system in which the deck is stacked against the filmmakers.
This video covers the campaign to pressure the MPAA to back down on its arbitrary R-rating.
Disturbed by the huge amount of power that the MPAA ratings board wields, the filmmaker seeks out the true identities of the anonymous raters who control what films make it to the multiplex (and which ones don't), hiring a private investigator to stake out MPAA headquarters.
Along the way, Dick speaks with numerous filmmakers whose careers have been negatively affected by the seemingly random judgments of the MPAA.
Predictably, the film was given an NC-17 rating by the MPAA, and Dick describes the unfair, arbitrary nature of the appeals process.
The MPAA was also caught red handed making copies of the film, something they go after others for, but the MPAA justified its hypocracy by claiming it was acting to protect its members (story about this HERE). Apparently the same rules they so zealously advocate for do not apply to them.