Before receiving a UK cinema certificate in 1973 the film was extensively cut by around 30 minutes by the BBFC with heavy edits to rape scenes, footage of sexual experiments, graphic violence, the fantasy murder sequence, and the opening scenes on the slave ship.
The directors cut (available only in Italian) now available on dvd is a complete re-edit of the film. It has 14 mins of new footage, including a new introduction which shows the reaction of African Americans to the death of Martin Luther King Jr. The new film is re-edited so that the timeline also continually shifts back and forth from the past to the present. Also much of the most disturbing footage was cut out.