Spandau Prison
In the aftermath of the Reichstag Fire of 1933, opponents of Hitler and journalists such as Egon Kisch and Carl von Ossietzky were held there in so-called protective custody.  Spandau Prison became a sort of predecessor of the Nazi concentration camps. It was supposed to be controlled by the Prussian Ministry of Justice but the Gestapo tortured and abused its inmates, as Egon Erwin Kisch recalls in his memories of Spandau Prison. By the end of 1933 the first Nazi concentration camps had been built (at Dachau, Osthofen, Oranienburg, Sonnenburg, Lichtenburg and the marshland camps around Esterwegen). All remaining prisoners in "protective custody" in state prisons were transferred to these concentration camps.