One of the most important factors on the content of films after 1966 was the creation of the ratings system by the MPAA.  Discuss the impact of changes in film classification on US cinema from the late 1960s onward.  Discuss the transition from the Production Code to its demise, the creation of the ratings system in 1968, the controversial films that were initially made, the rise of X film in the 1970s, and the various changes that have been made since. Focus on the film Dirty Harry (1971)