Dungeon of the Doomed(1979)

Original title: O Porão das Condenadas

After witnessing his father being killed in front of him by a gang of outlaws, a young boy grows up determined to learn how to shoot and make a plan for his revenge with the help of his uncle and his girlfriend. In the midst of his plan, the bandits imprison men and women in a dungeon, subjecting them to the most cruel tortures, rapes and acts of evil.