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 (character) a jumper, Callahan states he is known as Dirty Harry because he is assigned to "every dirty job that comes along". When Harry is ordered to deliver ransom money to Scorpio, Gonzalez opines "no wonder they call him Dirty Harry; [he] always gets the shit end of the stick". In "Dirty Harry", Gonzalez humorously suggests that Callahan's nickname may have an alternate origin given that he twice ends up peeking through a naked woman's window and later follows a suspect into a strip club. The films reveal little about Callahan's personal background. In the first film, Callahan tells Chico Gonzalez's