at the Hadamar Institute, May 1945. The Hadamar Trial, 8–15 October 1945, was the first mass atrocity trial in the
American occupation zone of Germany following World War II. U.S. military authorities decided to undertake their first prosecution to adjudicate crimes associated with the systematic racial and social persecution and extermination committed under Nazi Germany policies. Initially, American authorities intended to try Hadamar physicians, nurses, and administrative staff in their custody for the murders of nearly 15,000 German patients at the institution. At the time, however, they lacked jurisdiction to do so under international law. U.S. military officials could not try German nationals for murdering their fellow citizens. International law restricted them to prosecute crimes committed against their own service personnel and civilian nationals, and those of their allies, in the territories that they held. The six-man U.S. military tribunal sentenced the Hadamar chief administrator
Alfons Klein, and two male nurses,
Heinrich Ruoff and Karl Willig, to death by hanging. Chief physician
Adolf Wahlmann received a life sentence with hard labor due to his old age (he was nearly 70) and poor health. Two Hadamar administrative staff received sentences of 35 and 30 years with hard labor, respectively.
Irmgard Huber, a nurse and only female defendant, received the lightest sentence, that of 25 years imprisonment with hard labor. On 14 March 1946, Klein, Ruoff, and Willig were executed. In December 1945 the Allies promulgated Allied Control Council Law No. 10, which allowed the elastic charge of "
crimes against humanity" to cover the massive scale of extermination the Germans had carried out against Jews, Poles, Gypsies and other populations. This charge was introduced in the indictment by the
International Military Tribunal (IMT) at
Nuremberg. In early 1946, "euthanasia" crimes such as those at Hadamar were transferred to the German courts, newly reconstructed under the occupation. In early 1947, a German tribunal in
Frankfurt tried 25 Hadamar personnel, including Wahlmann and Huber, for the murder of some 15,000 German patients at the facility. Although some had their sentences increased, they were all released early in the 1950s. ==Post-war use of the site==