You find the stories of Irena Sendler, who defied the Nazis and saved 2,500 Jewish children by smuggling them out of the Warsaw Ghetto .. Maria von Maltzan, who risked everything to defy Hitler and the Nazi Régime .. Miep Gies, who risked her life daily to hide Anne Frank and her family .. the Rescue of the Danish Jews, Varian Fry, the American Schindler,  Kurt Gerstein SS Officer, the site Courage and Survival ..
The Nazis considered Jews to be the main danger to Germany. Jews were the primary victims of Nazi racism, but other victims included Roma (Gypsies) and people with mental or physical disabilities. The Nazis murdered some 200,000 Roma. And they murdered at least 250,000 mentally or physically disabled patients, mainly German and living in institutions, in the so-called Euthanasia Program.
A sampling of Wilson’s concerns as she matured appears in the interstices of her exchanges with Otto Frank, which, remarkably, date from 1959 until his death, in 1980. For instance: “The year was 1968—etched in my mind. I can’t ever forget it. Otis Redding was ‘Sittin’ on the Dock of the Bay’ . . . while we hummed along to ‘Hey Jude’ by the Beatles.” “In 1973-74,” she reports, “I was wearing headbands, pukka-shell necklaces, and American Indian anything. Tattoos were a rage”—but enough. Tattoos were the rage, she neglects to recall, in Auschwitz; and of the Auschwitz survivor who was her patient correspondent for more than two decades, Wilson remarks, “Well, what choice did the poor man have? Whenever an attack of ‘I-can’t-take-this-any-longer’ would hit me, I’d put it all into lengthy diatribes to my distant guru, Otto Frank.”

In response to a typhus epidemic in the women's camp, Mengele cleared one block of six hundred Jewish women and sent them to their deaths in the gas chambers. The building was then cleaned and disinfected, and the occupants of a neighboring block were bathed, de-loused, and given new clothing before being moved into the clean block. This process was repeated until all of the barracks were disinfected. Similar procedures were used for later epidemics of scarlet fever and other diseases, with infected prisoners being killed in the gas chambers. For these actions, Mengele was awarded the War Merit Cross (Second Class with swords) and was promoted in 1944 to First Physician of the Birkenau subcamp.[37]

The unstoppable Allied military advance continued and on July 24, 1944, Soviet troops liberated the first camp, Majdanek in eastern Poland, where over 360,000 had died. As the Soviet Army neared Auschwitz, Himmler ordered the complete destruction of the gas chambers. Throughout Hitler's crumbling Reich, the SS now began conducting death marches of surviving concentration camp inmates away from outlying areas, including some 66,000 from Auschwitz. Most of the inmates on these marches either dropped dead from exertion or were shot by the SS when they failed to keep up with the column.

Throughout the 1930s, the legal, economic, and social rights of Jews were steadily restricted.[83] On 1 April 1933, there was a boycott of Jewish businesses.[84] On 7 April 1933, the Law for the Restoration of the Professional Civil Service was passed, which excluded Jews and other "non-Aryans" from the civil service.[85] Jews were disbarred from practising law, being editors or proprietors of newspapers, joining the Journalists' Association, or owning farms.[86] In Silesia, in March 1933, a group of men entered the courthouse and beat up Jewish lawyers; Friedländer writes that, in Dresden, Jewish lawyers and judges were dragged out of courtrooms during trials.[87] Jewish students were restricted by quotas from attending schools and universities.[85] Jewish businesses were targeted for closure or "Aryanization", the forcible sale to Germans; of the approximately 50,000 Jewish-owned businesses in Germany in 1933, about 7,000 were still Jewish-owned in April 1939. Works by Jewish composers,[88] authors, and artists were excluded from publications, performances, and exhibitions.[89] Jewish doctors were dismissed or urged to resign. The Deutsches Ärzteblatt (a medical journal) reported on 6 April 1933: "Germans are to be treated by Germans only."[90]
Anti-Semitism in Europe did not begin with Adolf Hitler. Though use of the term itself dates only to the 1870s, there is evidence of hostility toward Jews long before the Holocaust–even as far back as the ancient world, when Roman authorities destroyed the Jewish temple in Jerusalem and forced Jews to leave Palestine. The Enlightenment, during the 17th and 18th centuries, emphasized religious toleration, and in the 19th century Napoleon and other European rulers enacted legislation that ended long-standing restrictions on Jews. Anti-Semitic feeling endured, however, in many cases taking on a racial character rather than a religious one.

If a front-page review in the New York Times Book Review can rocket a book to instant sanctity, that is what Meyer Levin, in the spring of 1952, achieved for “Anne Frank: The Diary of a Young Girl.” It was an assignment he had gone after avidly. Barbara Zimmerman (afterward Barbara Epstein, a founder of The New York Review of Books), the diary’s young editor at Doubleday, had earlier recognized its potential as “a minor classic,” and had enlisted Eleanor Roosevelt to supply an introduction. (According to Levin, it was ghostwritten by Zimmerman.) Levin now joined Zimmerman and Doubleday in the project of choosing a producer. Doubleday was to take over as Frank’s official agent, with the stipulation that Levin would have an active hand in the adaptation. “I think that I can honestly say,” Levin wrote Frank, “that I am as well qualified as any other writer for this particular task.” In a cable to Doubleday, Frank appeared to agree: “DESIRE LEVIN AS WRITER OR COLLABORATOR IN ANY TREATMENT TO GUARANTEE IDEA OF BOOK.” The catch, it would develop, lurked in a perilous contingency: Whose idea? Levin’s? Frank’s? The producer’s? The director’s? In any case, Doubleday was already doubtful about Levin’s ambiguous role: What if an interested producer decided on another playwright?
Upon arrival at a camp in mates were stripped of their clothes and shaved of all their body hair. Then they were given a shower, disinfected and given a uniform. each step was used to dehumanize prisoners, both physically and emotionally. Prisoners were then given a number. At Auschwitz the number was tattooed on their arm. Those who the Nazis thought were unable to work were token to what they called showers. The Nazis said to these prisoners who were about to meet their deaths it was to freshen up a bit after their long journey. Instead of water Zyklon B, developed to kill rodents, closed in on them. Death Did not usually come quickly but rather slowly. Most of the walls of the death chambers had scratch marks to show how victims tried to dig themselves out. The purpose of these cams were to kill huge amounts of Jews a day. Camps had been in Germany for years. These were the places  were tons of Jews had been murdered. Once at the camps selected people would work the others were gassed. Before being gassed they forced to march to the sound of music. An important camp was Treblinka. It was established for slave labor In 1941, but in 1942 it became a death camp. By may 1943 the population of Warsaw had been transported to Treblinka and other camps. By July 11, 1944 800,000 Jews had been murdered in Treblinkia. Unlike Treblinkia, Chelmno, Sobibor, and Balzac which were made to kill Jews. Maidanek and Auschwitz had a work camp attached. Upon arrival at these two camps a selection was made. 10% of the new arrivals would escape immediate gassing.   
From 1933 until 1938, most of the people held in concentration camps were political prisoners and people the Nazis labeled as "asocial." These included the disabled, the homeless, and the mentally ill. After Kristallnacht in 1938, the persecution of Jews became more organized. This led to the exponential increase in the number of Jews sent to concentration camps.
Auschwitz, perhaps the most notorious and lethal of the concentration camps, was actually three camps in one: a prison camp (Auschwitz I), an extermination camp (Auschwitz II–Birkenau), and a slave labour camp (Auschwitz III–Buna-Monowitz). Upon arrival, Jewish prisoners faced what was called a Selektion. A German doctor presided over the selection of pregnant women, young children, the elderly, handicapped, sick, and infirm for immediate death in the gas chambers. As necessary, the Germans selected able-bodied prisoners for forced labour in the factories adjacent to Auschwitz, where one German company, IG Farben, invested 700 million Reichsmarks in 1942 alone to take advantage of forced labour, a capital investment. The conglomerate presumed that slave labour would be a permanent part of the German economy. Deprived of adequate food, shelter, clothing, and medical care, these prisoners were literally worked to death. Periodically, they would face another Selektion. The Nazis would transfer those unable to work to the gas chambers of Birkenau.
This was upgraded on 31 July 1941, when Hermann Goering sent an order that Heydrich should make “all necessary preparations with regard to organisational, practical and financial aspects for an overall solution to the Jewish question”. Heydrich was to “submit an overall plan… for the execution of the intended ‘Final Solution’ of the Jewish question”.
Gerda Schrage was 24 years old when she was sent to Auschwitz-Birkenau in 1944. She had been in hiding in Berlin during the war, until someone betrayed her to the Gestapo and she was arrested. According to Gerda's story, as told in the documentary film "Gerda's Silence," when she arrived at Auschwitz, she was pregnant by a married man with whom she had had an affair while she was in hiding. Her baby died in her arms at Birkenau because Dr. Mengele was conducting yet another cruel experiment and would not allow her to nurse the baby.
Yet any projection of Anne Frank as a contemporary figure is an unholy speculation: it tampers with history, with reality, with deadly truth. “When I write,” she confided, “I can shake off all my cares. My sorrow disappears, my spirits are revived!” But she could not shake off her capture and annihilation, and there are no diary entries to register and memorialize the snuffing of her spirit. Anne Frank was discovered, seized, and deported; she and her mother and sister and millions of others were extinguished in a program calculated to assure the cruellest and most demonically inventive human degradation. The atrocities she endured were ruthlessly and purposefully devised, from indexing by tattoo through systematic starvation to factory-efficient murder. She was designated to be erased from the living, to leave no grave, no sign, no physical trace of any kind. Her fault—her crime—was having been born a Jew, and as such she was classified among those who had no right to exist: not as a subject people, not as an inferior breed, not even as usable slaves. The military and civilian apparatus of an entire society was organized to obliterate her as a contaminant, in the way of a noxious and repellent insect. Zyklon B, the lethal fumigant poured into the gas chambers, was, pointedly, a roach poison.
The passengers had landing certificates and transit visas by the Cuban Director-General of Immigration, Manuel Benitez Gonzalez. But, a week before the ship left, Cuban President Federico Laredo Bru published a decree that overturned all recent landing certificates. For them to land in Cuba, they needed written authorization from the Cuban Secretaries of State and Labor and a $500 bond. Most of the passengers were not prepared for the bureaucratic mess they were about to face in Cuba.

Belzec, Sobibor, and Treblinka formed part of what the Nazis called “Operation Reinhard,” whose sole purpose was the systematic massacre of Jews. A labor camp existing in Belzec since 1940 was turned into an extermination camp in the autumn of 1941, becoming operative in March 1942. In the same month, the camp at Sobibor was set up to alleviate the overburdened camp of Belzec. The third, Treblinka, received the Jews from Warsaw and the Radom district.
The deportees were forced into rail cars, most of which were windowless, unheated cattle cars, and squeezed in so tightly that most were forced to stand. The doors were then sealed shut from the outside. Neither drinking water nor sanitary facilities were available. Each car held more than 120 people, and many froze or suffocated to death or succumbed to disease during the trip to the camps. The dead were not removed from the cars during the journey because the Nazi bureaucracy insisted that each body entering a car be accounted for at the destination.

Death: Dr. Miklos Nyiszli was Mengele's prisoner pathologist. The autopsies became the final experiment. Nyiszli performed autopsies on twins who had died from the experiments or who had been purposely killed just for after-death measurements and examination. Some of the twins had been stabbed with a needle that pierced their heart and then was injected with chloroform or phenol, which caused near immediate blood coagulation and death. Some of the organs, eyes, blood samples and tissues would be sent to Verschuer for further study.
Soon after he became chancellor, Hitler called for new elections in an effort to get full control of the Reichstag, the German parliament, for the Nazis. The Nazis used the government apparatus to terrorize the other parties. They arrested their leaders and banned their political meetings. Then, in the midst of the election campaign, on February 27, 1933, the Reichstag building burned. A Dutchman named Marinus van der Lubbe was arrested for the crime, and he swore he had acted alone. Although many suspected the Nazis were ultimately responsible for the act, the Nazis managed to blame the Communists, thus turning more votes their way.

An emaciated 18-year-old Russian girl looks into the camera lens during the liberation of Dachau concentration camp in 1945. Dachau was the first German concentration camp, opened in 1933. More than 200,000 people were detained between 1933 and 1945, and 31,591 deaths were declared, most from disease, malnutrition and suicide. Unlike Auschwitz, Dachau was not explicitly an extermination camp, but conditions were so horrific that hundreds died every week. #

Similarly, in Ordinary Men (1992), Christopher Browning examined the deeds of German Reserve Police Battalion 101 of the Ordnungspolizei ("order police"), used to commit massacres and round-ups of Jews, as well as mass deportations to the death camps. The members of the battalion were middle-aged men of working-class background from Hamburg, who were too old for regular military duty. They were given no special training. During the murder of 1,500 Jews from Józefów in Poland, their commander allowed them to opt out of direct participation. Fewer than 12 men out of a battalion of 500 did so. Influenced by the Milgram experiment on obedience, Browning argued that the men killed out of peer pressure, not bloodlust.[471]
Along with several other Auschwitz doctors, Mengele transferred to Gross-Rosen concentration camp in Lower Silesia on 17 January 1945, taking with him two boxes of specimens and the records of his experiments at Auschwitz. Most of the camp medical records had already been destroyed by the SS[57][58] by the time the Red Army liberated Auschwitz on 27 January.[59] Mengele fled Gross-Rosen on 18 February, a week before the Soviets arrived there, and traveled westward to Žatec in Czechoslovakia, disguised as a Wehrmacht officer. There he temporarily entrusted his incriminating documents to a nurse with whom he had struck up a relationship.[57] He and his unit then hurried west to avoid being captured by the Soviets, but were taken prisoners of war by the Americans in June 1945. Although Mengele was initially registered under his own name, he was not identified as being on the major war criminal list due to the disorganization of the Allies regarding the distribution of wanted lists, and the fact that he did not have the usual SS blood group tattoo.[60] He was released at the end of July and obtained false papers under the name "Fritz Ullman", documents he later altered to read "Fritz Hollmann".[61]