As the German economy developed, the country began to suffer labour shortages. The concentration camp population was used to fill this void. After the Anschluss, thousands of Austrian Jews recently forced out of employment, non-Jewish ‘asocials’ and opponents of the Nazis were rounded up and used as a freely available source of forced labour. Many of these would provide the much-needed human resources to produce weapons, vehicles and goods for the German war effort.

After their arrest, the Franks, Van Pels and Fritz Pfeffer were sent by the Gestapo to Westerbork, a holding camp in the northern Netherlands. From there, in September 1944, the group was transported by freight train to the Auschwitz-Birkenau extermination and concentration camp complex in German-occupied Poland. Anne and Margot Frank were spared immediate death in the Auschwitz gas chambers and instead were sent to Bergen-Belsen, a concentration camp in northern Germany. In March 1945, the Frank sisters died of typhus at Bergen-Belsen; their bodies were thrown into a mass grave. Several weeks later, on April 15, 1945, British forces liberated the camp.
Auschwitz became a significant source of slave labor locally and functioned as an international clearing house. Of 2.5 million people who were deported to Auschwitz, 405,000 were given prisoner status and serial numbers. Of these, approximately 50 percent were Jews and 50 percent were Poles and other nationalities. Of those who received numbers, 65,000 survived. It is estimated that about 200,000 people passed through the Auschwitz camps and survived.

The camps were liberated by the Allied forces between 1944 and 1945. The first major camp, Majdanek, was discovered by the advancing Soviets on July 23, 1944. Auschwitz was liberated, also by the Soviets, on January 27, 1945; Buchenwald by the Americans on April 11; Bergen-Belsen by the British on April 15; Dachau by the Americans on April 29; Ravensbrück by the Soviets on the same day; Mauthausen by the Americans on May 5; and Theresienstadt by the Soviets on May 8.[42] Treblinka, Sobibór, and Bełżec were never liberated, but were destroyed by the Nazis in 1943. Colonel William W. Quinn of the U.S. 7th Army said of Dachau: "There our troops found sights, sounds, and stenches horrible beyond belief, cruelties so enormous as to be incomprehensible to the normal mind."[43][44]

In the early years of the regime, Germany was without allies, and its military was drastically weakened by the Versailles Treaty. France, Poland, Italy, and the Soviet Union each had reasons to object to Hitler's rise to power. Poland suggested to France that the two nations engage in a preventive war against Germany in March 1933. Fascist Italy objected to German claims in the Balkans and on Austria, which Benito Mussolini considered to be in Italy's sphere of influence.[52]
Hitler quickly became the party's most active orator, appearing in public as a speaker 31 times within the first year after his self-discovery.[55] Crowds began to flock to hear his speeches.[56] Hitler always spoke about the same subjects: the Treaty of Versailles and the Jewish question.[48] This deliberate technique and effective publicising of the party contributed significantly to his early success,[48] about which a contemporary poster wrote: "Since Herr Hitler is a brilliant speaker, we can hold out the prospect of an extremely exciting evening".[57] Over the following months, the party continued to attract new members,[41] while remaining too small to have any real significance in German politics.[58] By the end of the year, party membership was recorded at 2,000,[56] many of whom Hitler and Röhm had brought into the party personally, or for whom Hitler's oratory had been their reason for joining.[59]
Those deemed fit enough for slave labor were then immediately registered, tattooed with a serial number, undressed, deloused, had their body hair shaven off, showered while their clothes were disinfected with Zyklon-B gas, and entered the camp under the infamous gateway inscribed “Arbeit Macht Frei” (“Labor will set you free”). Of approximately 2.5 million people who were deported to Auschwitz, 405,000 were given prisoner status and serial numbers. Of these, approximately 50% were Jews and 50% were Poles and other nationalities.

One evening at inspection, the camp commander gave us an address in which he said that we were responsible for the murder of Herr vom Rath and that therefore we had committed a crime against the nation and the state; that we were in a camp for protective custody, which was not a prison or a penitentiary at all, nor a sanitarium either, but solely an educational institution; that we should learn here how to behave in dealing with a 'guest nation' (he really said 'guest' nation instead of 'host' nation); that the main thing was unconditional obedience and that all S.S. men were our superior officers; that each attempt at disobedience would be punished, in some cases by corporal punishment, and that all S. S. men were entitled to use their arms in any attempt at resistance or escape.
Kamil Bedkowski, 33, worked as an art conservator in Britain for eight years, even restoring ceiling frescoes at Windsor Castle. Now he is on the team shoring up the crumbling brick barracks of Birkenau where thousands slept at a time, crammed into decaying three-level wooden bunks. “This is the most challenging project I’ve ever worked on,” he said.
In 2018 the Polish government passed an amendment to its Act on the Institute of National Remembrance, making it a criminal offence to make false suggestions of Polish complicity in the Holocaust, which would include referring to Auschwitz and other camps as "Polish death camps".[304] After discussions with Israel's prime minister, amid international concern that the law would stifle research, the Polish government adjusted the amendment so that anyone falsely accusing Poland of complicity would be guilty only of a civil offence.[305]
The Auschwitz complex was divided in three major camps: Auschwitz I main camp or Stammlager; Auschwitz II, or Birkenau, established on October 8th, 1941 as a 'Vernichtungslager' (extermination camp); Auschwitz III or Monowitz, established on May 31th, 1942 as an 'Arbeitslager' or work camp; also several sub-camps. There were up to seven gas chambers using Zyklon-B poison gas and three crematoria. Auschwitz II included a camp for new arrivals and those to be sent on to labor elsewhere; a Gypsy camp; a family camp; a camp for holding and sorting plundered goods and a women's camp. Auschwitz III provided slave labor for a major industrial plant run by I G Farben for producing synthetic rubber (see Blechhammer). Highest number of inmates, including sub-camps: 155,000. The estimated number of deaths: 2.1 to 2.5 million killed in gas chambers, of whom about 2 million were Jews, and Poles, Gypsies and Soviet POWs. About 330,000 deaths from other causes.
Höss was succeeded as Auschwitz commandant in November 1943 by SS Obersturmbannführer Arthur Liebehenschel, who served until 15 May 1944. SS Sturmbannführer Richard Baer became commandant of Auschwitz I on 11 May 1944, and SS Obersturmbannführer Fritz Hartjenstein of Auschwitz II from 22 November 1943, followed by SS Obersturmbannführer Josef Kramer from 15 May 1944 until the camp's liquidation in January 1945. Heinrich Schwarz was commandant of Auschwitz III from the point at which it became an autonomous camp in November 1943 until its liquidation.[83]
The atrocities of Nazi Germany began well before the first shots of World War II were fired in 1939. Adolf Hitler became chancellor of Germany in 1933, and five weeks later, the Nazis established their first concentration camp. In 1935, the Nazis issued the Nuremberg Laws: "racial purity" laws that stripped German Jews of their citizenship. Violence broke out in November 1938, when Nazis destroyed Jewish businesses, homes, hospitals, and synagogues, killed nearly 100 and arrested some 30,000 Jewish men in what came to be known as Kristallnacht. By 1939, 300,000 Jewish refugees had fled Nazi controlled territories. By the war's end in 1945, six million Jews and millions of other victims had died in the Holocaust.
In March 1941, Himmler ordered a second, larger complex to be built next to the original camp. It was called Auschwitz II - Birkenau. The camp at Birkenau was divided into subsections surrounded by electric fences with barbed wire. During 1943 and 1944 the BIIb section became the location of the „Terezín family camp“. At its summit, Birkenau had over 100 000 inmates. In March 1942, the Auschwitz III camp was set up at nearby Monowitz, also known as Buna Monowitz. German company I.G. Farben set up a synthetic rubber factory there, in which it used the prisoners' slave labour. Auschwitz also had a further 45 auxiliary camps, where prisoners were forced to engage in slave labour, mostly for German companies.
Otto had prepared a secret hideout next to his place of work. The door was hidden behind some bookshelves. The hideout was small. The first floor had a bathroom and a small kitchen. The second floor had two rooms, one for Anne and Margot and one for her parents. There was also an attic where they stored food and where Anne would sometimes go to be alone.
I’m often asked how I have coped. I never went to a psychologist and I never will. Quite simply, I kept it at a distance. I saw and understood, and yet I didn’t. I’ve never cried over the columns of children and mothers I saw. When I was in Auschwitz I thought: ‘This is not actually on earth.’ It was a system of masters and slaves, gods and subhumans and I thought to myself: ‘No one knows about it. It’s the forest, surrounded by multiple layers of fence, it’s not actually real.’ I never let it penetrate that my parents were killed and I even thought: ‘After this we’re going home and everyone will be there again.’ Those who never managed to keep it distant killed themselves.
At some point during her induction, Lasker-Wallfisch mentioned she played the cello. “That is fantastic,” the inmate processing her said. “You will be saved.” The Birkenau women’s orchestra, responsible for keeping prisoners in step as they marched to work assignments, needed a cellist. “It was a complete coincidence,” Lasker-Wallfisch said, shaking her head. “The whole thing was complete insanity from beginning to end.”

Information about Auschwitz became available to the Allies as a result of reports by Captain Witold Pilecki of the Polish Home Army (Armia Krajowa), who volunteered to be imprisoned there in 1940. As "Thomasz Serfiński", he allowed himself to be arrested in Warsaw and spent 945 days in the camp, from 22 September 1940[200] until his escape on 27 April 1943. Michael Fleming writes that Pilecki was instructed to sustain morale, organize food, clothing and resistance, prepare to take over the camp if possible, and smuggle information out to the Polish military.[201] Pilecki called his resistance movement Związek Organizacji Wojskowej (ZOW, "Union of Military Organization").[200]

Once Hitler gained control of the government, he directed Nazi Germany’s foreign policy toward undoing the Treaty of Versailles and restoring Germany’s standing in the world. He railed against the treaty’s redrawn map of Europe and argued it denied Germany, Europe’s most populous state, “living space” for its growing population. Although the Treaty of Versailles was explicitly based on the principle of the self-determination of peoples, he pointed out that it had separated Germans from Germans by creating such new postwar states as Austria and Czechoslovakia, where many Germans lived.
Hitler expressed opposition to capitalism, regarding it as having Jewish origins and accusing capitalism of holding nations ransom to the interests of a parasitic cosmopolitan rentier class.[51] He also expressed opposition to communism and egalitarian forms of socialism, arguing that inequality and hierarchy are beneficial to the nation.[52] He believed that communism was invented by the Jews to weaken nations by promoting class struggle.[53] After his rise to power, Hitler took a pragmatic position on economics, accepting private property and allowing capitalist private enterprises to exist so long as they adhered to the goals of the Nazi state, but not tolerating enterprises that he saw as being opposed to the national interest.[37]
Hayden’s comment, for example, that he had walked the ramp at Birkenau where women and children were separated, is essentially false; Jewish women with children arriving at Auschwitz were generally all murdered immediately upon arrival. After seeing the inside of the U.S. refugee facilities, we can also safely say they aren’t the kind of summer camps we would send our children to, either.
In the meantime the inmates of the camp had assembled for the evening roll call. We heard rhythmic beats on a big drum, and I could see a man walking through the rows of the assembled men carrying a drum in front of him and beating on it. Soon after, loud cries of pain were heard. The carrier of the drum was tied to a block and subjected to twenty-five blows from a steel rod: his punishment for attempting to escape.
The lead editors of the Encyclopedia of Camps and Ghettos, 1933–1945 of the United States Holocaust Memorial Museum, Geoffrey Megargee and Martin Dean, cataloged some 42,500 Nazi ghettos and camps throughout Europe, spanning German-controlled areas from France to Russia and Germany itself, operating from 1933 to 1945. They estimate that 15 million to 20 million people died or were imprisoned in the sites.[36]