The Big Bird Cage (1972)

Teri, a young woman in pursuit of social status, was accidentally involved in the activities of two revolutionaries Brosen and Django and found herself in a women's concentration camp. In the middle of the camp is a towering wooden machine ("big birdcage"). Under the gaze of evil watchmen, women risk their lives to deal with sugar. The prisoners were brutally abused by prison guards and fellow inmates, and all attempts to escape were... Permanently disposed of. Terry's only hope of escape lies in Brother and her revolutionary allies.