The Killers Are Our Guests (1974)
In the city of Milan, a brutal gang of thieves rob a jewelry store and just manage to escape capture by the police. During the robbery, one of the gang members is severely wounded and needs medical attention immediately. The thieves discover a prominent surgeon lives nearby, so they bust their way into his house and force the doctor to aid the wounded gangster. While the injured man is convalescing, the sadistic gang decides to have fun with the doctor and his beautiful wife. All manner of sexual and physical torture ensue. The doctor is forced to risk more than his life to end the barbaric state of affairs.