Dirty Harry local and federal police committing offences and overstepping their authority by entrapment and obstruction of justice. Author McGilligan, argued that America needed a hero, a winner at a time when the authorities were losing the battle against crime. The box-office success of "Dirty Harry" led to the production of four sequels. In the 2007 film "Zodiac", also set in San Francisco and inspired by the Zodiac Killer, cartoonist Robert Graysmith approaches police detective Dave Toschi at the cinema, where he is watching "Dirty Harry" with his wife. When Graysmith tells Toschi he is going to catch the Zodiac killer, Toschi
Dirty Harry to have received several death threats and was forced to get an unlisted telephone number. In real life, Robinson is a pacifist who deplores the use of firearms. Early in principal photography on the film, Robinson would reportedly flinch in discomfort every time he was required to use a gun. As a result, Siegel was forced to halt production briefly and sent Robinson for brief training in order to learn how to fire a gun convincingly. Milius says his main contribution to the film was "a lot of guns. And the attitude of Dirty Harry, being a cop who was