As the mass shootings continued in Russia, the Germans began to search for new methods of mass murder. This was driven by a need to have a more efficient method than simply shooting millions of victims. Himmler also feared that the mass shootings were causing psychological problems in the SS. His concerns were shared by his subordinates in the field.[251] In December 1939 and January 1940, another method besides shooting was tried. Experimental gas vans equipped with gas cylinders and a sealed compartment were used to kill the disabled and mentally-ill in occupied Poland.[252] Similar vans, but using the exhaust fumes rather than bottled gas, were introduced to the Chełmno extermination camp in December 1941,[253] and some were used in the occupied Soviet Union, for example in smaller clearing actions in the Minsk ghetto.[254] They also were used for murder in Yugoslavia.[255]

Meanwhile, beginning in the fall of 1939, Nazi officials selected around 70,000 Germans institutionalized for mental illness or disabilities to be gassed to death in the so-called Euthanasia Program. After prominent German religious leaders protested, Hitler put an end to the program in August 1941, though killings of the disabled continued in secrecy, and by 1945 some 275,000 people deemed handicapped from all over Europe had been killed. In hindsight, it seems clear that the Euthanasia Program functioned as a pilot for the Holocaust.
As U.S. Army troops neared the Dachau sub-camp at Landsberg on 27 April 1945, the SS officer in charge ordered that 4,000 prisoners be murdered. Windows and doors of their huts were nailed shut. The buildings were then doused with gasoline and set afire. Prisoners who were naked or nearly so were burned to death, while some managed to crawl out of the buildings before dying. Earlier that day, as Wehrmacht troops withdrew from Landsberg am Lech, towns people hung white sheets from their windows. Infuriated SS troops dragged German civilians from their homes and hanged them from trees.[73][74]

By the spring of 1942, the Nazis had established six killing centers (death camps) in Poland: Chelmno (Kulmhof), Belzec, Sobibor, Treblinka, Maidanek and Auschwitz. All were located near railway lines so that Jews could be easily transported daily. A vast system of camps (called Lagersystem) supported the death camps. The purpose of these camps varied: some were slave labor camps, some transit camps, others concentration camps and their sub­camps, and still others the notorious death camps. Some camps combined all of these functions or a few of them. All the camps were intolerably brutal.

Though it had ancient roots, Nazi ideology was far from a primitive, medieval throwback - it was capable of appealing to intelligent and sophisticated people. Many high-ranking Nazis had doctoral degrees and early supporters included such eminent people as philosopher Martin Heidegger, theologian Martin Niemoeller, and commander-in-chief of German forces in the First World War, General Erich Ludendorff. Hitler appealed with a powerful vision of a strong, united and 'racially' pure Germany, bolstered by pseudo-scientific ideas that were popular at the time.

The novel was adapted as the 1993 movie Schindler's List by Steven Spielberg. After acquiring the rights in 1983, Spielberg felt he was not ready emotionally or professionally to tackle the project, and he offered the rights to several other directors.[95] After he read a script for the project prepared by Steven Zaillian for Martin Scorsese, he decided to trade him Cape Fear for the opportunity to do the Schindler biography.[96] In the film, the character of Itzhak Stern (played by Ben Kingsley) is a composite of Stern, Bankier, and Pemper.[27] Liam Neeson was nominated for the Academy Award for Best Actor for his portrayal of Schindler in the film,[97] which won seven Oscars, including Best Picture.[98]

The Holocaust was the systematic, bureaucratic, state-sponsored persecution and murder of six million Jews by the Nazi regime and its collaborators. Holocaust is a word of Greek origin meaning “sacrifice by fire.” The Nazis, who came to power in Germany in January 1933, believed that Germans were “racially superior” and that the Jews, deemed “inferior,” were an alien threat to the so-called German racial community.

The first commander of Dachau, Hilmar Wäckerle, was dismissed from his position by Heinrich Himmler after charges of murder were brought against him by a Munich court for the deaths of several prisoners who had died after being severely punished. Another Dachau Commandant, Alex Piorkowski, was also dismissed by Himmler and was expelled from the Nazi party for breaking the strict rules set by Eicke.

Concentration camp crematorium being shown to a US soldier  © Organised killing began with the outbreak of war in September 1939, but the first victims were not Jews. The Nazis set about killing people with physical and mental disabilities, whom they regarded as a burden on the state and a threat to the nation's 'racial hygiene'. About 170,000 people were eventually killed under this so-called Euthanasia programme, which also pioneered techniques and employed many of the people later used to kill Jews.
Gun did not explain how these 300 prisoners died on the night of the liberation of the camp, but he did write that the prisoners had weapons and that the International Committee of Dachau had made sure that the prisoners who had cooperated with the German guards were not allowed to escape. Others may have died from eating too much of the canned food and chocolate given to them by the Americans, and undoubtedly there were deaths among the 900 prisoners sick with typhus in the infirmary.

Medical experiments conducted on camp inmates by the SS were another distinctive feature.[51] At least 7,000 prisoners were subjected to experiments; most died as a result, during the experiments or later.[52] Twenty-three senior physicians and other medical personnel were charged at Nuremberg, after the war, with crimes against humanity. They included the head of the German Red Cross, tenured professors, clinic directors, and biomedical researchers.[53] Experiments took place at Auschwitz, Buchenwald, Dachau, Natzweiler-Struthof, Neuengamme, Ravensbrück, Sachsenhausen, and elsewhere. Some dealt with sterilization of men and women, the treatment of war wounds, ways to counteract chemical weapons, research into new vaccines and drugs, and the survival of harsh conditions.[52]

The prisoners of Dachau concentration camp originally were to serve as forced labor for a munition factory, and to expand the camp. It was used as a training center for SS guards and was a model for other concentration camps.[28] The camp was about 300 m × 600 m (1,000 ft × 2,000 ft) in rectangular shape. The prisoners' entrance was secured by an iron gate with the motto "Arbeit macht frei" ("Work will make you free"). This reflected Nazi propaganda, which trivialized concentration camps as labor and re-education camps, when in fact forced labor was used as a method of torture and murder.[29]
The camp was liberated on April 15, 1945, by the British 11th Armoured Division.[4] The soldiers discovered approximately 60,000 prisoners inside, most of them half-starved and seriously ill,[5] and another 13,000 corpses, including those of Anne and Margot Frank, lying around the camp unburied.[4] The horrors of the camp, documented on film and in pictures, made the name "Belsen" emblematic of Nazi crimes in general for public opinion in many countries in the immediate post-1945 period. Today, there is a memorial with an exhibition hall at the site.