prison camp 
noun
A camp where prisoners of war or political prisoners are kept under guard.When Italy capitulates to the Allies, the Italian jailers desert from the prison camp and the prisoners are left to fend for themselves....
- Yet Ngende has been subjected to violent racial attacks, and has spent time in Dungavel, which he describes, unequivocally, as ‘a prison camp, not a detention centre’.
- The confrontation took place at the Woomera Detention Centre, a prison camp for asylum seekers, situated in the heart of the Australian desert, hundreds of miles from the nearest city.