In Autumn 1943, the camp administration was reorganized following a corruption scandal. By the end of 1943, the prisoner population of Auschwitz main camp, Birkenau, Monowitz and other sub-camps was over 80,000: 18,437 in the main camp, 49,114 in Birkenau, and 13,288 at Monowitz where I G Farben had its synthetic rubber plant. Up to 50,000 prisoners were scattered around 51 sub-camps such as Rajsko, an experimental agricultural station, and Gleiwitz, a coal mine (see The List of the Camps for a complete list of those sub-camps).

The National Socialist German Workers' Party (Nationalsozialistische Deutsche Arbeiterpartei, NSDAP; Nazi Party) was founded in 1920. It was the renamed successor of the German Workers' Party (DAP) formed one year earlier, and one of several far-right political parties then active in Germany.[5] The NSDAP party platform included destruction of the Weimar Republic, rejection of the terms of the Treaty of Versailles, radical antisemitism, and anti-Bolshevism.[6] They promised a strong central government, increased Lebensraum ("living space") for Germanic peoples, formation of a national community based on race, and racial cleansing via the active suppression of Jews, who would be stripped of their citizenship and civil rights.[7] The Nazis proposed national and cultural renewal based upon the Völkisch movement.[8] The party, especially its paramilitary organisation Sturmabteilung (SA; Storm Detachment; Brownshirts), used physical violence to advance their political position, disrupting the meetings of rival organisations and attacking their members (as well as Jewish people) on the streets.[9] Such far-right armed groups were common in Bavaria, and were tolerated by the sympathetic far-right state government of Gustav Ritter von Kahr.[10]

Antisemitic legislation passed in 1933 led to the removal of all Jewish teachers, professors, and officials from the education system. Most teachers were required to belong to the Nationalsozialistischer Lehrerbund (NSLB; National Socialist Teachers League) and university professors were required to join the National Socialist German Lecturers.[349][350] Teachers had to take an oath of loyalty and obedience to Hitler, and those who failed to show sufficient conformity to party ideals were often reported by students or fellow teachers and dismissed.[351][352] Lack of funding for salaries led to many teachers leaving the profession. The average class size increased from 37 in 1927 to 43 in 1938 due to the resulting teacher shortage.[353]
Researchers and Jewish thinkers such as Bruno Bettelheim (1903–1990), Lawrence Langer, Art Spiegelman, Richard Bernstein and, the sharpest of them, Cynthia Ozick, feel that this sentence, especially as it appears at the end of the play and the movie based on the diary, says that perhaps Auschwitz did not exist at all, that all people are good; that it is a Christian blessing promising God’s mercy to everyone, regardless of their actions; that the difficulty in digesting the Holocaust leads to its being pushed aside, if not denied outright. These thinkers opposed the diary’s adaptations, not Anne’s diary itself, which was courageously Jewish and anti-German, and revealing from a human, familial and national perspective. Yet adaptations and translations continued to be published over their protests, and the diary continued to be rendered universal and sterile, forgiving and comfortable to read and identify with.
Otto Frank survived his internment in Auschwitz. After the war ended, he returned to Amsterdam, where he was sheltered by Jan and Miep Gies as he attempted to locate his family. He learned of the death of his wife, Edith, in Auschwitz, but remained hopeful that his daughters had survived. After several weeks, he discovered Margot and Anne had also died. He attempted to determine the fates of his daughters' friends and learned many had been murdered. Sanne Ledermann, often mentioned in Anne's diary, had been gassed along with her parents; her sister, Barbara, a close friend of Margot's, had survived.[63] Several of the Frank sisters' school friends had survived, as had the extended families of Otto and Edith Frank, as they had fled Germany during the mid-1930s, with individual family members settling in Switzerland, the United Kingdom, and the United States.[64]
Those deported to Auschwitz arrived at the nearby train station and were marched or trucked to the main camp where they were registered, tattooed, 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 make you free")
As Soviet troops closed in on Auschwitz in late January 1945, the SS hurriedly evacuated some 56,000 prisoners on death marches to the west, then blew up the Birkenau gas chambers and crematoria to erase evidence of the mass murders. The Red Army liberated Auschwitz on January 27, 1945. Some 6,000 people were still alive at Birkenau. Another 1,000 were found at the main camp.
In Germany the words 'protective custody' have a double meaning. Originally the term meant the incarceration of people who were threatened by others and who were guarded for their own safety so that they might be protected from their enemies. Now, however, men in protective custody are mostly those who are brought, for the 'protection of the people and the State,' into a concentration camp without hearing, without court sentence, without the possibility of redress, and for an indefinite time. Frequently people sentenced by a court are taken into protective custody by the Gestapo after serving their prison sentence, often directly from the prison gate. Such, for example, was the fate of Pastor Niemöller, who, after being released from prison, was taken into the camp Sachsenhausen near Oranienburg, the camp with which we shall be concerned here. He is in solitary confinement there, and I never saw him.
As a result of the Holocaust, the term "concentration camp" carries many of the connotations of "extermination camp" and is sometimes used synonymously. Because of these ominous connotations, the term "concentration camp", originally itself a euphemism, has been replaced by newer terms such as internment camp, resettlement camp, detention facility, etc., regardless of the actual circumstances of the camp, which can vary a great deal.