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 round put up by the MoD. Dirty Harry round Dirty Harry is the name given to the special round chambered 5.56×45mm. The rounds are designed by BAE Systems and were safety and performance tested by QinetiQ to supplement the existing 5.56 standard NATO ammunition issued to British Forces. The necessity to use a more powerful round in place of regular 5.56mm NATO round was felt due to its unsatisfactory performance in medium-range engagements. This resulted in the Ministry of Defence (MoD) requesting the development of a special round to be used from the existing SA80 rifles resulting in Dirty Harry. The