The SA leadership continued to apply pressure for greater political and military power. In response, Hitler used the Schutzstaffel (SS) and Gestapo to purge the entire SA leadership. Hitler targeted SA Stabschef (Chief of Staff) Ernst Röhm and other SA leaders who—along with a number of Hitler's political adversaries (such as Gregor Strasser and former chancellor Kurt von Schleicher)—were arrested and shot. Up to 200 people were killed from 30 June to 2 July 1934 in an event that became known as the Night of the Long Knives.
Aware that as witnesses to the killings they would eventually be killed themselves, the Sonderkommandos of Birkenau Kommando III staged an uprising on 7 October 1944, following an announcement that some of them would be selected to be "transferred to another camp"—a common Nazi ruse for the murder of prisoners. They attacked the SS guards with stones, axes, and makeshift hand grenades, which they also used to damage Crematorium IV and set it on fire. As the SS set up machine guns to attack the prisoners in Crematorium IV, the Sonderkommandos in Crematorium II also revolted, some of them managing to escape the compound. The rebellion was suppressed by nightfall.
In the spring of 1941, German conglomerate I.G. Farben established a factory in which its executives intended to exploit concentration camp labor to manufacture synthetic rubber and fuels. I.G. Farben invested more than 700 million Reichsmarks (about 2.8 million US dollars in 1941 terms) in Auschwitz III. From May 1941 until July 1942, the SS had transported prisoners from Auschwitz I to the “Buna Detachment,” at first on foot and later by rail. (Between July and October 1942 there was a pause in transports, due to a typhus epidemic and quarantine.) With the construction of Auschwitz III in the autumn of 1942, prisoners deployed at Buna lived in Auschwitz III.
Medical experiments, many of them pseudoscientific, were performed on concentration camp inmates beginning in 1941. The most notorious doctor to perform medical experiments was SS-Hauptsturmführer Dr. Josef Mengele, camp doctor at Auschwitz. Many of his victims died or were intentionally killed. Concentration camp inmates were made available for purchase by pharmaceutical companies for drug testing and other experiments.
I had trained as a tailor and had left home before we were deported, when I went to work four miles away on a ranch. It was taken over by the SS, so suddenly I found myself working for them. In May 1943 they lined us up one day and told us to empty our pockets. If they found even a single zloty in anyone’s pocket, they were shot on the spot. We were transported to Majdanek, which was only 19 miles away – a torture camp in the true sense of the word. For 500 metres there were just ditches full of bodies, legs, heads. We were deported to Auschwitz four weeks later. We arrived in the early morning and they gave us a bed, a real shower, they cleaned us well with disinfectant and shaved us. After that they gave us striped uniforms and tattooed us. I was given the number 128164 on my left arm and from that point on I was a number, no longer a name.
Use of the word "concentration" came from the idea of confining people in one place because they belong to a group that is considered undesirable in some way. The term itself originated in 1897 when the "reconcentration camps" were set up in Cuba by General Valeriano Weyler. In the past, the U.S. government had used concentration camps against Native Americans and the British had also used them during the Second Boer War. Between 1904 and 1908, the Schutztruppe of the Imperial German Army operated concentration camps in German South-West Africa (now Namibia) as part of its genocide of the Herero and Namaqua peoples. The Shark Island Concentration Camp in Lüderitz was the largest camp and the one with the harshest conditions.