Escola Penal de Meninas Violentadas (1977)

Young prostitutes are led to a penal school run by a group of nuns so that they can recover. However, the current Mother Superior is in fact a mad assassin who had killed the real one and taken her place, changing the whole regime. The girls are savagely punished and humiliated, including by a brutal jailer, who often uses a whip to enforce the penalties imposed by the fake mother. Meanwhile, police are investigating a bone found in the vicinity of the school, when they discover a tortured and unconscious young woman. When she comes to life, she reveals to the police the new mother's methods. Clandestinely, an investigator begins photographing the penal school to gather evidence that would enable the delegate to arrest the culprits. The delegate recognizes one of the photos of Mother Superior as the mad fugitive she had been looking for so long, and the school is overrun by the police ending unworthy treatment of girls.