The second Dirty Harry movie, Magnum Force concerns itself with a vigilante group that has targeted notorious scofflaws for extermination. When a prominent gang boss or drug-runner is set free by the airheaded liberal courts, a covert group of "avengers" is soon on hand to blow the miscreant to bits. While detective Dirty Harry Callahan (Clint Eastwood) is no great friend of civil liberties, he is dead set against wholesale murder as a solution to legal loopholes. Discovering that all the killings have been committed by the same weapon, Callahan reaches the conclusion that his on-the-edge partner, Charlie McCoy (Mitchell Ryan), is responsible. But the answer is less transparent than that, as Harry learns almost at the cost of his own life. Co-scripted by John Milius and Michael Cimino, Magnum Force was followed by three additional Dirty Harry installments: The Enforcer (1976), Sudden Impact (1983) and The Dead Pool (1988).
~ Hal Erickson, All Movie Guide