Attached is a first-hand account describing the daily goings-on at Hitler's Plotzensee Prison.
Written by Jan Valtin (alias of Richard Julius Hermann Krebs: 1905 - 1951), one of the few inmates to make his way out of that highly inclusive address and tell the tale. Krebs was a communist in the German resistance movement who later escaped to New York and wrote a book (Out of the Night
) about his experiences in Nazi Germany.
"The prisoner who has served his sentence is usually not released; he is surrendered to the Gestapo for an indefinite term in one of the concentration camps, preferably Sachsenhausen or Buchenwald. Incurable hard cases are sent to Dachau... "
From Amazon: Out of the Night: The Memoir of Richard Julius Herman Krebs alias Jan Valtin