The Nazis also used Dachau prisoners as subjects in brutal medical experiments. For example, inmates were obligated to be guinea pigs in a series of tests to determine the feasibility of reviving individuals immersed in freezing water. For hours at a time, prisoners were forcibly submerged in tanks filled with ice water. Some prisoners died during the process.
Most of the survivors in the DP camp at Bergen Belsen were young people. They found themselves entirely alone, having lost their parents, spouses, children and siblings during the Holocaust. They commonly chose to establish a feeling of normality and fight despair by marrying in the DP camp. During the first year after liberation, in the Bergen Belden DP camp, there were often six weddings a day, and up to fifty weddings a week. During 1946, there were 1,070 weddings at Bergen Belsen. 
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.
Originally established as a prisoner of war camp, in 1943, parts of Bergenbelsen became a concentration camp. Initially it was an “exchange camp,” where Jewish hostages were held with the intention of exchanging them for German prisoners of war held overseas. The camp was later expanded to accommodate Jews from other concentration camps. It is also the location where writer Anne Frank passed away.
Eicke urged his SS men to treat all inmates as dangerous "Enemies of the State." He repeatedly lectured them: "There behind the barbed-wire lurks the enemy and he watches everything you do. He will try to help himself by using all your weaknesses. Don't leave yourself open in any way. Show these 'Enemies of the State' your teeth. Anyone who shows even the smallest sign of compassion for the 'Enemies of the State' must disappear from our ranks. I can only use hard men who are determined to do anything. We have no use for weaklings."
In May 1944, Martin Gottfried Weiss was appointed the department head of the Office Group D in the SS Main Office of Economic Administration (WVHA) at Oranienburg. That same year, Weiss became the commander of the five sub-camps of Dachau at Mühldorf; when the Mühldorf prisoners were evacuated and brought to the main camp in the Spring of 1945, Weiss returned to Dachau. Fourteen members of the staff at Mühldorf were put on trial at Dachau from April 1 through May 13, 1947 in the case of US vs. Franz Auer et al.
The liberated inmates had to be kept in the camp until the typhus epidemic could be brought under control. The Americans used DDT, a new insecticide not being used in Germany, to kill the lice in the camp. When the epidemic ended, the concentration camp was immediately turned into War Crimes Enclosure No. 1 for 30,000 Germans who had been arrested as war criminals and were awaiting trial by an American Military Tribunal. Most of them were released by 1948 for lack of evidence, although some were transferred to France for trial.
Defined by the religion of their grandparents rather than by their own beliefs, Jews were viewed as having impure blood lines. The new laws were taught in schools, cementing anti-Semitism in German culture. Most Germans kept quiet, often benefiting when Jews lost jobs and businesses. Persecution of other minorities also escalated: the police were given new powers to arrest homosexuals and compulsory abortions were administered to women considered to be ‘hereditarily ill’.
Beginning in late 1941, the Germans began mass transports from the ghettoes in Poland to the concentration camps, starting with those people viewed as the least useful: the sick, old and weak and the very young. The first mass gassings began at the camp of Belzec, near Lublin, on March 17, 1942. Five more mass killing centers were built at camps in occupied Poland, including Chelmno, Sobibor, Treblinka, Majdanek and the largest of all, Auschwitz-Birkenau. From 1942 to 1945, Jews were deported to the camps from all over Europe, including German-controlled territory as well as those countries allied with Germany. The heaviest deportations took place during the summer and fall of 1942, when more than 300,000 people were deported from the Warsaw ghetto alone.
Since March 1945, around 15,000 new prisoners had been accommodated in a camp that was originally designed for 5,000 men. By the time the liberators arrived, there were over 30,000 prisoners in the camp. There was a typhus epidemic in the camp but the Germans had no DDT, nor typhus vaccine, available to stop it. Up to 400 prisoners per day were dying of typhus by the time that the Americans arrived. There was no coal to burn the bodies in the ovens and the staff could not keep up with burying the bodies in mass graves on a hill several miles from the camp.
Several resistance groups were formed, such as the Jewish Combat Organization in the Warsaw Ghetto and the United Partisan Organization in Vilna.[310] Over 100 revolts and uprisings occurred in at least 19 ghettos and elsewhere in Eastern Europe. The best known is the Warsaw Ghetto Uprising of 1943, when around 1,000 poorly armed Jewish fighters held the SS at bay for four weeks.[311][q] During a revolt in Treblinka on 2 August 1943, inmates killed five or six guards and set fire to camp buildings; several managed to escape.[316][317] In the Białystok Ghetto on 16 August 1943, Jewish insurgents fought for five days when the Germans announced mass deportations.[318] On 14 October 1943, Jewish prisoners in Sobibór, including Jewish-Soviet prisoners of war, attempted an escape,[319] killing 11 SS officers and a couple of Ukrainian camp guards.[320] Around 300 escaped, but 100 were recaptured and shot.[321] On 7 October 1944, 300 Jewish members of the Sonderkommando at Auschwitz, who learned they were about to be killed, attacked their guards and blew up crematorium IV. Three SS officers were killed, one of whom was stuffed into an oven, as was a German kapo. None of the Sonderkommando rebels survived the uprising.[322]
The German view of the Roma as hereditary criminals and "asocials" was reflected in their classification in the concentration camps, where they were usually counted among the asocials and given black triangles to wear.[420] According to Niewyk and Nicosia, at least 130,000 died out of nearly one million in German-occupied Europe.[415] The United States Holocaust Memorial Museum calculates at least 220,000.[421] Ian Hancock, who specializes in Romani history and culture, argues for between 500,000 and 1,500,000.[422] The treatment of the Roma was not consistent across German-occupied territories. Those in France and the Low Countries were subject to restrictions on movement and some confinement to collection camps, while those in Central and Eastern Europe were sent to concentration camps and murdered by soldiers and execution squads.[423] Before being sent to the camps, the Roma were herded into ghettos, including several hundred into the Warsaw Ghetto.[219] Further east, teams of Einsatzgruppen tracked down Romani encampments and murdered the inhabitants on the spot, leaving no records of the victims.[423] After the Germans occupied Hungary, 1,000 Roma were deported to Auschwitz.[424][x]
Most of the survivors in the DP camp at Bergen Belsen were young people. They found themselves entirely alone, having lost their parents, spouses, children and siblings during the Holocaust. They commonly chose to establish a feeling of normality and fight despair by marrying in the DP camp. During the first year after liberation, in the Bergen Belden DP camp, there were often six weddings a day, and up to fifty weddings a week. During 1946, there were 1,070 weddings at Bergen Belsen. 
During the last months before the liberation, the prisoners at Dachau had to live under extremely inhuman conditions, which even they would not have been able to imagine. The gigantic transports continually arriving from other Nazi camps evacuated in the face of the advancing Allied forces, brought human beings who were, for the most part, reduced to skeletons and exhausted to the point of death.
The area of the former Bergen-Belsen camp fell into neglect after the burning of the buildings and the closure of the nearby displaced persons' camp in the summer of 1950. The area reverted to heath; few traces of the camp remained. However, as early as May 1945, the British had erected large signs at the former camp site. Ex-prisoners began to set up monuments.[30] A first wooden memorial was built by Jewish DPs in September 1945, followed by one made in stone, dedicated on the first anniversary of the liberation in 1946. On November 2, 1945, a large wooden cross was dedicated as a memorial to the murdered Polish prisoners. Also by the end of 1945 the Soviets had built a memorial at the entrance to the POW cemetery. A memorial to the Italian POWs followed in 1950, but was removed when the bodies were reinterred in a Hamburg cemetery.
German communists, socialists and trade unionists were among the earliest opponents of the Nazis[443] and among the first to be sent to concentration camps.[444] Before the invasion of the Soviet Union, Hitler issued the Commissar Order, which ordered the execution of all political commissars and Communist Party members captured.[445] Nacht und Nebel ("Night and Fog") was a directive of Hitler in December 1941, resulting in the disappearance of political activists throughout the German-occupied territories.[446]
Every morning started with the dreaded command, "Appelle!" (roll-call!). Regardless of the weather, the prisoners were required to march outside at dawn and stand at attention in formation to be counted. Upon the command, "Hats Off!" the entire assembly of 9,000 men was required to remove all hats precisely at the same moment to the satisfaction of the SS man in charge. Prisoners sometimes practiced this and other drills for hours with some actually dropping dead from the length and rigor of roll-call. When the tally of prisoners was complete and the SS officer in command was satisfied, the prisoners were marched off to begin their 12-hour workday in a camp workshop or along the camp grounds.
Raphael Lemkin, a holocaust survivor who worked on the Nuremberg Trials, coined the term genocide and spent 4 years pushing for it to be added to international law. As Champetier de Ribes, the French Prosecutor at the Nuremberg Trials explained “This [was] a crime so monstrous, so undreamt of in history throughout the Christian era up to the birth of Hitlerism that the term ‘genocide’ has had to be coined to define it.” Ultimately, in 1948 The United Nations Convention on the Prevention and Punishment of Genocide was adopted, and it entered into force in 1951. The convention defined genocide in legal terms based on Lemkin’s work, and is the basis for genocide prevention efforts today.
The 40-year-old Eicke was a veteran of World War I who had earned the Iron Cross 2nd Class. After the war he became involved in police work but had lost various jobs because of his strong opposition to Germany's democratic republic. He joined the Nazi Party in December 1928 and was then taken into the SS. Himmler appointed him as a full SS colonel in November 1931. Four months later, he fled to Italy on Himmler's orders after being sentenced to jail for participating in Nazi political bombings. Himmler brought him back to Germany in February 1933. But more trouble occurred after Eicke clashed with a local Gauleiter who had him hauled off to a psychiatric clinic as a "dangerous lunatic." Himmler had him released from the psychiatric lock-up on June 26, then immediately handed him the task of running Dachau.
The whole corner where the barracks stand is enclosed by a high wire entanglement. The prisoners are warned that these are live wires, but this is a false alarm. This enclosed area is about 1,800 feet square, and contains a pool filled with muddy water, which, shrewdly photographed, appeared in the Munich Illustrierte Zeitung of July 16, 1933, as a swimming pool for the prisoners. From this enclosure leads a gangway, also protected by barbed wire and machine guns, to a spacious workshop, part of which is the kitchen and the other part drill-room and mess hall. Farther away are the guard houses, equipped with heating facilities. They are the officers’ quarters and contain workshops for cobblers, cabinet-makers, etc.
Although Dachau was in existence for 12 years, most people know only the horror described by the soldiers in the 42nd Rainbow Infantry Division and the 45th Thunderbird Infantry Division after they had liberated the camp on April 29, 1945. Three weeks before, on April 9, 1945, a bomb had hit the camp, knocking out a water main and the source of electricity. There was no running water in the camp and drinking water had to be brought in by trucks. There was no water for the showers, nor any water to flush the toilets. There was however, one last vestige of what the camp had been like before Germany was bombed back to the Stone age: fresh flowers in a vase in the undressing room for the gas chamber.
For the German rulers, the ghetto was a temporary measure, a holding pen for the Jewish population until a policy on its fate could be established and implemented. For the Jews, ghetto life was the situation under which they thought they would be forced to live until the end of the war. They aimed to make life bearable, even under the most trying circumstances. When the Nazis prohibited schools, they opened clandestine schools. When the Nazis banned religious life, it persisted in hiding. The Jews used humour as a means of defiance, so too song. They resorted to arms only late in the Nazi assault.
After 1942, the number of prisoners regularly held at the camp continued to exceed 12,000.[37] Dachau originally held Communists, leading Socialists and other “enemies of the state” in 1933, but over time the Nazis began to send German Jews to the camp. In the early years of imprisonment, Jews were offered permission to emigrate overseas if they “voluntarily” gave their property to enhance Hitler’s public treasury.[37] Once Austria was annexed and Czechoslovakia was defeated, the citizens of both countries became the next prisoners at Dachau. In 1940, Dachau became filled with Polish prisoners, who constituted the majority of the prisoner population until Dachau was officially liberated.[38]

In 1944, Plaszow transitioned from a labor camp to a concentration camp and all Jews were to be sent to the death camp at Auschwitz. Schindler requested Göth allow him to relocate his factory to Brnĕnec, in the Sudetenland, and produce war goods. He was told to draw up a list of workers he wanted to take with him. With Stern’s help, Schindler created a list of 1,100 Jewish names he deemed “essential” for the new factory. Permission was granted and the factory was moved. Not wanting to contribute to the German war effort, Schindler ordered his workers to purposefully make defective products that would fail inspection. The employees spent the remaining months of the war in the factory.

“At this point in the war and in his life, I think Oskar Schindler was absolutely determined to do everything he could to save as many Jews as he could regardless of the cost, either personal or financial,” writes Crowe. “During the last two years of the war, he had undergone a dramatic moral transformation, and, in many ways, he came more and more to associate himself with his Jews than with other Germans.”

In 1944, Josiah DuBois, Jr. wrote a memorandum to then-Secretary of the Treasury Henry Morgenthau, Jr. entitled “Report to the Secretary on the Acquiescence of This Government in the Murder of the Jews”, which condemned the bureaucratic interference of U.S. State Department policies in obstructing the evacuation of Holocaust Refugees from Romania and Occupied France. The Report would spur the Roosevelt administration to create the War Refugee Board later that year.
Sanitation was incredibly inadequate, with few latrines and water faucets for the tens of thousands of prisoners interned in Bergen-Belsen at this time. Overcrowding, poor sanitary conditions, and the lack of adequate food, water, and shelter led to an outbreak of diseases such as typhus, tuberculosis, typhoid fever, and dysentery, causing an ever increasing number of deaths. In the first few months of 1945, tens of thousands of prisoners died.

Methods of mass murder evolved at local levels as well as being decreed from Nazi high command. Killing squads rounded up and shot entire Jewish communities. Over two days in Kiev, 33,771 Jews were shot. The murder of Jews rapidly escalated, in part because local Nazi leaders didn’t have enough room to place them in the ghettos. By the end of the year, plans to implement the systematic slaughter of Jews by using gas in mobile trucks and gas chambers were well underway.
The camp of huts near Fallingbostel became known as Stalag XI-B and was to become one of the Wehrmacht's largest POW camps, holding up to 95,000 prisoners from various countries.[6] In June 1940, Belgian and French POWs were housed in the former Bergen-Belsen construction workers' camp. This installation was significantly expanded from June 1941, once Germany prepared to invade the Soviet Union, becoming an independent camp known as Stalag XI-C (311). It was intended to hold up to 20,000 Soviet POWs and was one of three such camps in the area. The others were at Oerbke (Stalag XI-D (321)) and Wietzendorf (Stalag X-D (310)). By the end of March 1942, some 41,000 Soviet POWs had died in these three camps of starvation, exhaustion, and disease. By the end of the war, the total number of dead had increased to 50,000.[6] When the POW camp in Bergen ceased operation in early 1945, as the Wehrmacht handed it over to the SS, the cemetery contained over 19,500 dead Soviet prisoners.