Kaindl, died in custody within a few months. In 1956, those who were still alive were released and sent back to Germany. The Dutch sought the extradition from Czechoslovakia of Antonín Zápotocký, who became President of Czechoslovakia, for his alleged role in the murder of Dutch prisoners during his time as a kapo at the camp. In the GDR, various subsequent trials took place against members of the SS guards of Sachsenhausen concentration camp, such as Roland Puhr and Arnold Zöllner. Puhr was executed in 1964, while Zöllner was sentenced to life imprisonment by the Rostock District Court in 1966. In the Federal Republic of Germany, there were also various follow-up trials against guards members, such as the Sachsenhausen trials in Cologne in the 1960s. In 1960, a trial against SS-Hauptscharführer and Blockführer Richard Bugdalle for the murder of concentration camp inmates took place before the Munich II Regional Court. In March 2009 Josias Kumpf, 83 was deported from Wisconsin back to Austria after having been found to have been a SS Guard at KZ Sachsenhausen and Trawniki. In May 2022, a trial began in Germany against a SS guard at KZ Sachsenhausen of SS-Rottenführer Josef Schuetz age 101. East Germany East German barracks After the Soviets vacated the site, it was used for some years by East Germany's "Kasernierte Volkspolizei", notionally a police division and in reality a precursor of the country's own National People's Army, which was formally established in 1956. Sachsenhausen National Memorial Site ("Nationale Mahn- u. Gedenkstätte Sachsenhausen") In 1956, planning began for the adaptation of the concentration camp site as a national memorial. This was inaugurated four years later on 23 April 1961 by Walter Ulbricht, First Secretary of the Socialist Unity Party (SED). The first director of the renamed "Sachsenhausen National Memorial Site" ("Nationale Mahn- u. Gedenkstätte Sachsenhausen") was Christian Mahler, at one time a senior police officer, who back in the Nazi period had been an inmate at Sachsenhausen between 1938 and 1943. The plans involved the removal of most of the original buildings and the construction of an obelisk, statue and meeting area, reflecting the outlook of the government of East Germany of that time. Other than the memorial sites in Buchenwald and Ravensbrück, the Sachsenhausen memorial, where the official celebrations of the German Democratic Republic (GDR) were held, was located in the former concentration camp. It was controlled by the Ministry