female convict scorpion jailhouse 41 (1972)

aka Joshuu sasori: Dai-41 zakkyo-bô. Sasori: Jailhouse 41. Scorpion: Female Prisoner Cage #41.
"It sure is hell here."
Scorpion (Meiko Kaji), has spent a year in solitary for attacking the warden, and gets a one day reprieve whilst a dignitary visits. Spotting a chance she attacks again, and is condemned to further punishment and after being raped by the guards, is attacked and left for dead by some prisoners. This gives her the chance to escape with six others that beat her, and she is quick to take the opportunity.
The sequel to Female Prisoner #701: Scorpion, continues Scorpion's decent into hell with rape, sadism and gore, all done with an art house sensibility.