Although there have been persistent claims of betrayal by an informant, the source of the information that led the authorities to raid the Achterhuis has never been identified. Night watchman Martin Sleegers and an unidentified police officer investigated a burglary at the premises in April 1944 and came across the bookcase concealing the secret door. Tonny Ahlers, a member of the National Socialist Movement in the Netherlands (NSB), was suspected of being the informant by Carol Ann Lee, biographer of Otto Frank. Another suspect is stockroom manager Willem van Maaren. The Annex occupants did not trust him, as he seemed inquisitive regarding people entering the stockroom after hours. He once unexpectedly asked the employees whether there had previously been a Mr. Frank at the office. Lena Hartog was suspected of being the informant by Anne Frank's biographer Melissa Müller. Several of these suspects knew one another and might have worked in collaboration. While virtually everyone connected with the betrayal was interrogated after the war, no one was definitively identified as being the informant.
The rise of Nazism in Germany during the 1930s—and the conviction that Hitler could be defeated only by military force—prompted Einstein rethink his strict pacifist views. Increasing numbers of Jewish refugees were fleeing Germany, bringing with them horrific tales of Nazi persecution; Einstein, who was also Jewish, left for the United States in 1932.
The eight residents of the secret annex were transported to Auschwitz on the last train leaving the transit camp Westerbork. After a month at Auschwitz, Anne and her sister Margot were transported to Bergen-Belsen concentration camp, where thousands of people died everyday from hunger and sickness. Margot and Anne both contracted typhus and died within a short time of each other in March 1945, only a few weeks before the liberation.
By early 1934, the focus shifted towards rearmament. By 1935, military expenditures accounted for 73 percent of the government's purchases of goods and services. On 18 October 1936, Hitler named Göring as Plenipotentiary of the Four Year Plan, intended to speed up rearmament. In addition to calling for the rapid construction of steel mills, synthetic rubber plants, and other factories, Göring instituted wage and price controls and restricted the issuance of stock dividends. Large expenditures were made on rearmament in spite of growing deficits. Plans unveiled in late 1938 for massive increases to the navy and air force were impossible to fulfil, as Germany lacked the finances and material resources to build the planned units, as well as the necessary fuel required to keep them running. With the introduction of compulsory military service in 1935, the Reichswehr, which had been limited to 100,000 by the terms of the Versailles Treaty, expanded to 750,000 on active service at the start of World War II, with a million more in the reserve. By January 1939, unemployment was down to 301,800 and it dropped to only 77,500 by September.
The Nazis claimed that Bismarck was unable to complete German national unification because Jews had infiltrated the German parliament and they claimed that their abolition of parliament had ended this obstacle to unification. Using the stab-in-the-back myth, the Nazis accused Jews—and other populations who it considered non-German—of possessing extra-national loyalties, thereby exacerbating German antisemitism about the Judenfrage (the Jewish Question), the far-right political canard which was popular when the ethnic Völkisch movement and its politics of Romantic nationalism for establishing a Großdeutschland was strong.
At this time only the main camp, later known as Auschwitz I, had been established. Himmler ordered the construction of a second camp for 100,000 inmates on the site of the village of Brzezinka, roughly two miles from the main camp. This second camp, now known as Birkenau or Auschwitz II, was initially intended to be filled with captured Russian POWs who would provide the slave labor to build the SS “utopia” in Upper Silesia. Chemical giant I G Farben expressed an interest in utilizing this labor force, and extensive construction work began in October 1941 under terrible conditions and with massive loss of life. About 10,000 Russian POWs died in this process. The greater part of the apparatus of mass extermination was eventually built in the Birkenau camp and the majority of the victims were murdered here.
Despite its economic and political success, Nazism maintained its power by coercion and mass manipulation. The Nazi regime disseminated a continual outpouring of propaganda through all cultural and informational media. Its rallies—especially its elaborately staged Nürnberg rallies—its insignia, and its uniformed cadres were designed to impart an aura of omnipotence. The underside of its propaganda machine was its apparatus of terror, with its ubiquitous secret police and concentration camps. It fanned and focused German anti-Semitism to make the Jews a symbol of all that was hated and feared. By means of deceptive rhetoric, the party portrayed the Jews as the enemy of all classes of society.
The courtyard between blocks 10 and 11, known as the "death wall" served as an execution area for Poles not in Auschwitz who had been sentenced to death by a criminal court—presided over by German judges—including for petty crimes such as stealing food. Several rooms in block 11 were deemed the Polizei-Ersatz-Gefängnis Myslowitz in Auschwitz ("Alternative jail of the police station at Mysłowice"). There were also Sonderbehandlung cases ("special treatment") for Poles and others regarded as dangerous to the Third Reich. Members of the camp resistance were shot there, as were 200 of the Sonderkommandos who took part in the Sonderkommando revolt in October 1944. Thousands of Poles were executed at the death wall; Höss wrote that "execution orders arrived in an unbroken stream".
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.