Auschwitz Birkenau was the principal and most notorious of the six concentration and extermination camps established by Nazi Germany to implement its Final Solution policy which had as its aim the mass murder of the Jewish people in Europe. Built in Poland under Nazi German occupation initially as a concentration camp for Poles and later for Soviet prisoners of war, it soon became a prison for a number of other nationalities. Between the years 1942-1944 it became the main mass extermination camp where Jews were tortured and killed for their so-called racial origins. In addition to the mass murder of well over a million Jewish men, women and children, and tens of thousands of Polish victims, Auschwitz also served as a camp for the racial murder of thousands of Roma and Sinti and prisoners of several European nationalities.
By the end of the war, the number of people who had died in the concentration camps, from all causes—starvation, sickness, exhaustion, beating, shooting, gassing—was more than eight hundred thousand. The figure does not include the hundreds of thousands of Jews gassed on arrival at Auschwitz. If the K.L. were indeed a battlefront, as the Death’s-Head S.S. liked to believe, the deaths, in the course of twelve years, roughly equalled the casualties sustained by the Axis during the Battle of Stalingrad, among the deadliest actual engagements of the war. But in the camps the Nazis fought against helpless enemies. Considered as prisons, too, the K.L. were paradoxical: it was impossible to correct or rehabilitate people whose very nature, according to Nazi propaganda, was criminal or sick. And as economic institutions they were utterly counterproductive, wasting huge numbers of lives even as the need for workers in Germany became more and more acute.
A parallel system to the main camp in Auschwitz began to operate at the Birkenau camp by 1942. The exception, though, was that the majority of “showers” used to delouse the incoming prisoners proved to be gas chambers. At Birkenau, only about 10 percent of Jewish transports were registered, disinfected, shaven and showered in the “central sauna” before being assigned barracks as opposed to being sent directly to the death chambers.
The extermination camp Treblinka was working from July 1942 to November 1943. In August 1943 an uprising destroyed many of the facilities. 900,000 Jews lost their lives in this camp.    Auschwitz-Birkenau, which also functioned as a concentration camp and a work camp, became the largest killing centre. It is estimated that between 1 and 2 million were killed in the extermination camp Auschwitz-Birkenau. The first gassing experiments, involving 250 Polish and 600 Soviet POW’s, were carried out as early as September 1941. The extermination camp was started up in March 1942 and ended its work in November 1944. 

Turkey: For much of its modern history, Turkey has pursued a policy of forced assimilation towards its minority peoples; this policy is particularly stringent in the case of the Kurds—until recently referred to as the “mountain Turks”—who make up 20 percent of the total population. The policy has included forced population transfers; a ban on use of the Kurdish language, costume, music, festivals, and names; and extreme repression of any attempt at resistance. Large revolts were suppressed in 1925, 1930, and 1938, and the repression escalated with the formation of the PKK as a national liberation party, resulting in civil war in the Kurdish region from 1984 to 1999.
After our liberation I went to Sweden where we were looked after marvellously. The physical recovery was not as bad as the emotional and mental one, which I’m still working on. I am still touched by the memory of a doctor who taught me how to walk again, as through the malnutrition I was incapable. Such a simple thing, but he told me: “I have a daughter like you,” and how vital that statement of his was to my sense of becoming a human being again. It was amazing to be compared to someone having felt completely dehumanised for so long.
Heinrich Himmler's Schutzstaffel (SS) took full control of the police and the concentration camps throughout Germany in 1934–35.[5] Himmler expanded the role of the camps to hold so-called "racially undesirable elements", such as Jews, Gypsies/Romanis/Sintis, Serbs, Poles, disabled people, and criminals.[6][7][8] The number of people in the camps, which had fallen to 7,500, grew again to 21,000 by the start of World War II[9] and peaked at 715,000 in January 1945.[10]