Summertime Killer (1972)

aka’s: Un Verano Para Matar/Meurtres Au Soleil/Ricatto Alla Mala

Twenty years after witnessing mobsters kill his father, Ray Castor (Christopher Mitchum) begins to track down and eliminate the men who did it, determined to wipe out the entire gang. Ex-cop John Kiley (Karl Malden) is hired to track Castor down. Also with Olivia Hussey and Claudine Auger.