only to be closed in 1996 due to the unavailability of the perpetrators for interrogation (who either went missing or were already dead). A parallel inquiry by German federal officials was also closed. The topic of the camp returned to prominence in early 2000s, not least due to the July 2001 Sejm resolution commemorating the victims of the concentration camp, so the Regional Prosecutor's Office in Warsaw decided to open the Warsaw concentration camp case once again in 2002. The case was first managed by the Institute of National Remembrance's District Commission in Warsaw, then it was transferred to Łódź, but was promptly returned to the capital. On 23 January 2017, the case was closed for the fourth time. Criminal responsibility of perpetrators Following Allied victory in World War II, some people related to the Warsaw concentration camp's history were convicted in criminal or military courts. 53 SS officers and prisoner functionaries were convicted by the judiciary of the Polish People's Republic, who in most cases received relatively light sentences. Five Schutzstaffel officers from the camp were executed for their role in administering KL Warschau; seven died in prison and the rest was released in 1956 at the latest. Some members of KL Warschau staff were convicted in Dachau trials in the American zone of Allied-occupied Germany. Wilhelm Ruppert, Alfred Kramer and , for instance, received death penalties in the Dachau camp trial (Ruppert and Kramer were executed in 1946, while Mielenz died in prison); , the camp doctor, also received capital punishment and was hanged in 1947, though he was indicted in a different trial, which concerned the Mauthausen-Gusen camp. , who was a prisoner functionary, was also sentenced to death for his activities in KL Warschau in an East German court in 1950, but this was reduced to life imprisonment on appeal. , whom Bogusław Kopka described as among the most cruel staff members of KL Warschau, was ultimately convicted in the Third Majdanek Trial. In 1981, a court in Düsseldorf in West Germany gave him a 6-year prison term. In addition to that, Theodor Szehinskyj, a former guard who immigrated to the US in the 1950s, had his US citizenship stripped as a federal court in Pennsylvania found in July 2000 that he had lied in his initial visa application about his past in the SS Totenkopf Division, including in the Warsaw concentration camp; the decision was