<Li> The Exorcist (1973)--based on William Peter Blatty's novel of the same name, which is based on a 1949 case of demonic possession that Blatty heard about as a student at Georgetown University </Li> <Li> Papillon (1973)--based on the life of French convict Henri Charrière </Li> <Li> Serpico (1973)--the story of New York City policeman Frank Serpico, played by Al Pacino, directed by Sidney Lumet </Li> <Li> Walking Tall (1973)--about real life Sheriff Buford Pusser, a former wrestler turned lawman in McNairy County, Tennessee </Li>

List of all movies based on true stories