The Mauthausen-Gusen camp trials were a set of trials of SS concentration camp personnel following World War II, heard by an American military government court at Dachau. Between March 29 and May 13, 1946, and then from August 6 to August 21, 1947, a total of 69 former camp personnel were tried. Among them were some of the former guards at the Mauthausen-Gusen concentration camp system and August Eigruber, a former Gauleiter of Upper Austria. Origins In 1942, overwhelming reports of German atrocities and large scale massacres against concentration camp inhabitants came to surface from exiled governments and Jewish organizations. With increased tension from the public and overwhelming evidence, the Allied powers being the United States, Great Britain, and the Soviet Union had no choice but to intervene. The Allied powers issued a statement condemning the actions of those involved and promising to bring each and every SS personnel to justice with no chance of dismissal. The Allied nations' foreign ministers met in Russia a year later and were better known as ‘The Big Three’. Those who committed war crimes were broken up into two war crimes categories. These groups were divided by those with no particular geographic location who would be punished by the Allies, and those who committed crimes within a specific location who would be tried in courts within their jurisdiction. The United States involvement within the trials had difficulties ranging from a lack of international policy knowledge and being understaffed, which led to pure chaos. Those sent to investigate the war crimes lacked proper training which yielded reports with sub-par information. The U.S. encountered countless obstacles. Ultimately in 1945, the United States committed to two distinct war crimes trial programs, one under American military jurisdiction and one in collaboration with the Allied powers. First Mauthausen camp trial The first trial of personnel from Mauthausen-Gusen took place in the Dachau concentration camp between March 29 and May 13, 1946. Among the accused were 60 former members of the camp's administration and August Eigruber, a former Gauleiter of Upper Austria. Among the defendants were also Viktor Zoller (former commander of the SS-Totenkopfverbande guard battalion), and doctors Friedrich Entress (an SS member and a medic who practiced medical experiments on hundreds of inmates; killing most of them with injections of phenol), Eduard Krebsbach and Erich Wasicky handed the Zyklon B to the person who was responsible for running camp's