If a prisoner knows exactly what to expect you have lost some of your power.

If a prisoner has or knows the material which reaches the department, that is sufficient.

But the prisoners somehow always knew who in the free world remembered them and what they did.

What these prisoners knew, someone must have told them.

At this time the prisoners of war knew more about the invasion than the German people.

The prisoners did not know the purpose of the blood sampling, he said.

And they always made sure the other prisoners knew exactly who the child molesters were.

The prisoners also knew that steps would be taken to preserve their health.

The prisoners, and the Germans as well, knew liberation was close at hand.

Though- it seems you and the prisoner know each other?