Chained Heat 2 (1969) on Netflix

An innocent woman is sent to a Czech prison, where the sadistic warden and guards rape and perform bizarre sex acts on the prisoners.

Ten years after the original Chained Heat (1983), this follow-up appeared, more of a remake than a sequel to the first film. Alex, an American tourist in Prague, Czechoslovakia, who is unjustly arrested and incarcerated at Razik Prison. There, the bodacious, drug-addicted warden Magda rules with an iron fist and the help of her sadistic assistant, Rosa, a prisoner who has become a trustee. It seems that they have set up the beautiful Alex, the latest in a long line of physically attractive women they've ensnared at the prison for use as unwilling prostitutes at a nearby casino and as actresses in cheap porn films. While Alex befriends a fellow newcomer, Tina and a transvestite named Bobo, her sister Susan attempts to get help on the outside from an American diplomat.

—Karl Williams