Commandants of Gusen reported directly to Mauthausen commandant
Franz Ziereis. The first commandant was Anton Streitwieser, who was dismissed in May 1940 for running an unauthorized pig farm and feeding the pigs with rations siphoned from the supply intended for prisoners. From 25 May 1940 to October 1942 or January 1943, the SS commandant was
Karl Chmielewski, who had been a member of the SS since 1932 and the
camp SS since 1935. His (Report Supervisor) was and Kurt Kirchner was the labor service leader. Often drunk, he personally beat, kicked, whipped, and killed prisoners; he had considerable autonomy in running the camp and ensured that life was characterized by violence and sadism. During Chmielewski's rule, one half of prisoners died. From October 1942 until the end of the war, Friedrich August Seidler was the commandant. Seidler preferred "Prussian-style" brutality instead of his predecessor's indiscriminate style. Until 1943, Gusen was run more as a branch of the main camp than as a subcamp, although it had separate administrative departments, such as
Political Department. Initially, the watchtowers, equipped with machine guns and searchlights, were made of wood; later they were replaced by granite. In addition to the barbed-wire fence, an additional stone wall high was built around it in 1941; patrols of guards went between the barriers. A third fence, of barbed wire, was added to encircle the entire camp complex, including external factories and quarries. The SS had a separate complex for its own barracks, located outside of the prisoner camp. In February 1940, there were about 600 SS guards (one for each ten prisoners). This later increased to 2,000, and 3,000 by 1944. They belonged to four
Camp SS companies, part of . In early 1945, many were drafted into the and were replaced by Viennese firemen, former Wehrmacht personnel, and militiamen.
Nazi human experimentation took place at Gusen, including surgical and tuberculosis experiments. SS physician
Helmuth Vetter, who arrived in 1944, conducted the tuberculosis experiments by injecting the lungs of healthy prisoners with phlegmonic pus. The victims were then forced to run until they collapsed, at which point they were killed by
benzene injection to the lungs, which prolonged the dying process. Most of the prisoner functionaries, especially block leaders, were German criminal prisoners who were initially picked by Chmielewski. Some kapos were notorious for their brutality, including Wolf, a German who executed prisoners by hanging and stamped on the bodies, and the Spaniards Asturias, Félix Domingo, Indalecio González González, Losa, Tomás, and a man called "el Negro". The Austrian kapo Rudolf Fiegl participated in gassing inmates. On Sundays, football teams played on the for SS amusement. Participants were rewarded with extra rations. In 1942, a
Nazi camp brothel opened at the camp in order to reduce the number of prisoner functionaries who were tempted to coerce young male inmates into sex. At the brothel ten women, all considered "Aryan", were coerced into offering sex in exchange for a false promise of their freedom. Most of them were drafted into a women's Waffen-SS unit in March 1945. ==Execution==