fourth Totenkopf regiment (Ostmark) were recruited in Austria shortly thereafter. On Heydrich's orders, mass arrests of potential enemies of the Reich began immediately after the Anschluss. Mauthausen was the first concentration camp opened in Austria following the Anschluss. Before the invasion of the Soviet Union, Mauthausen was the harshest of the camps in the Greater German Reich. The Hotel Metropole was transformed into Gestapo headquarters in Vienna in April 1938. With a staff of 900 (80 percent of whom were recruited from the Austrian police), it was the largest Gestapo office outside Berlin. An estimated 50,000 people were interrogated or tortured there. The Gestapo in Vienna was headed by Franz Josef Huber, who also served as chief of the Central Agency for Jewish Emigration in Vienna. Although its de facto leaders were Adolf Eichmann and later Alois Brunner, Huber was nevertheless responsible for the mass deportation of Austrian Jews. Post-war activity and aftermath Following Nazi Germany's collapse, the SS ceased to exist. Numerous members of the SS, many of them still committed Nazis, remained at large in Germany and across Europe. On 21 May 1945, the British captured Himmler, who was in disguise and using a false passport. At an internment camp near Lüneburg, he committed suicide by biting down on a cyanide capsule. Several other leading members of the SS fled, but some were quickly captured. Kaltenbrunner, chief of the RSHA and the highest-ranking surviving SS main department chief upon Himmler's suicide, was captured and arrested in the Bavarian Alps. He was among the 22 defendants put on trial at the International Military Tribunal in 1945–46. Some SS members were subject to summary execution, torture, and beatings at the hands of freed prisoners, displaced persons, or Allied soldiers. American soldiers of the 157th Regiment, who entered the concentration camp at Dachau in April 1945 and saw the human deprivation and cruelty committed by the SS, shot some of the remaining SS camp guards. On 15 April 1945, British troops entered Bergen-Belsen. They placed the SS guards on starvation rations, made them work without breaks, forced them to deal with the remaining corpses, and stabbed them with bayonets or struck them with their rifle butts if they slowed their pace. Some members of the US Army Counter Intelligence Corps delivered captured SS camp guards to displaced person camps, where they knew they would be subject to summary execution. International Military