Summertime Killer (Un verano para matar) (1972)

Another List From Kill Bill (184 items)
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A six-year-old boy witnesses mobsters beat his father to death. Twenty years later, the now-grown boy begins to track down and eliminate the men who did it, determined to wipe out the entire gang. A police detective investigating the killings, and the Mafia boss who heads the gang, are just as determined to stop him.