What Have They Done to Your Daughters? (Italian: La polizia chiede aiuto) is a 1974 Italian film directed by Massimo Dallamano. The film is about police officers investigating a case of a 14-year-old Silvia Polvesi who has been found hanged after receiving an anonymous phone call. After interrogating suspescts and witnesses, a tape is discovered where several sexual encounters are recorded. This leads the police to an underage prostitution ring.