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. While it was formally operated by the Prussian Ministry of Justice, the Gestapo tortured and abused its inmates, as Kisch recalled in his memories of the prison. By the end of 1933 the first Nazi concentration camps had been erected (at Dachau, Osthofen, Oranienburg, Sonnenburg, Lichtenburg and the marshland camps around Esterwegen); all remaining prisoners who had been held in so-called protective custody in state prisons were transferred to these concentration camps.