Ruth Elias and her husband had conceived a child while she was a prisoner in the Theresienstadt camp, and when she arrived at Birkenau on a transport of Czech prisoners in December 1943, she was three months pregnant. Ruth passed several selections for the gas chamber even though she was obviously pregnant; she and her husband were assigned to the Czech "family camp." On July 11, 1944, after a selection made by Dr. Mengele, 3,000 prisoners in the Czech family camp, who were not considered fit to work, were sent to the gas chamber, but Ruth passed the selection even though she was in her eighth month of pregnancy. On July 14, 1944, Ruth was sent to Hamburg, Germany to work in clearing rubble from Allied bombing raids.

Theodor Holman wrote in reply to Sietse van der Hoek that the diary entry for 28 September 1942 proved conclusively the character's fictional origin.[citation needed] Jacqueline van Maarsen agreed,[citation needed] but Otto Frank assumed his daughter had her real acquaintance in mind when she wrote to someone of the same name.[citation needed] However, Kitty Egyedi said in an interview that she was flattered by the assumption, but doubted the diary was addressed to her:

Approximately 30 physicians served at Auschwitz while Mengele was assigned to the camp. As a required part feature of their “rounds,” medical staff performed “selections” of prisoners on the ramp. These selections determined who from among the mass of humanity arriving at Auschwitz would be retained for work and who would perish immediately in the gas chambers.
Himmler ordered the closure of ghettos in Poland in mid-July 1942; most inhabitants were sent to extermination camps. Those Jews needed for war production would be confined in concentration camps.[220] The deportations from the Warsaw Ghetto began on 22 July; over the almost two months of the Aktion, until 12 September, the population was reduced from 350,000 to 65,000. Those deported were transported in freight trains to the Treblinka extermination camp.[221] Similar deportations happened in other ghettos, with many ghettos totally emptied.[222] The first ghetto uprisings occurred in mid-1942 in small community ghettos.[223] Although there were armed resistance attempts in both the larger and smaller ghettos in 1943, in every case they failed against the overwhelming German military force, and the remaining Jews were either killed or deported to the death camps.[224]
One extraordinary aspect of the journey to the death camps was that the Nazis often charged Jews deported from Western Europe train fare as third class passengers under the guise that they were being "resettled in the East." The SS also made new arrivals in the death camps sign picture postcards showing the fictional location "Waldsee" which were sent to relatives back home with the printed greeting: "We are doing very well here. We have work and we are well treated. We await your arrival."
"You are still here?" Dr. Mengele left the head of the column, and with a few easy strides caught up with her. He grabbed her by the neck and proceeded to beat her head to a bloody pulp. He hit her, slapped her, boxed her, always her head--screaming at her at the top of his voice, "You want to escape, don't you. You can't escape now. This is not a truck, you can't jump. You are going to burn like the others, you are going to croak, you dirty Jew," and he went on hitting her poor unprotected head. As I watched, I saw her two beautiful, intelligent eyes disappear under a layer of blood. Her ears weren't there any longer. Maybe he had torn them off. And in a few seconds, her straight, pointed nose was a flat, broken, bleeding mass. I closed my eyes, unable to bear it any longer, and when I opened them up again, Dr. Mengele had stopped hitting her. But instead of a human head, Ibi's tall, thin body carried a round blood-red object on its bony shoulders, an unrecognizable object, too horrible to look at; he pushed her back into line. Half an hour later, Dr. Mengele returned to the hospital. He took a piece of perfumed soap out of his bag and, whistling gaily with a smile of deep satisfaction on his face, he began to wash his hands.
Often, reading Anne Frank's diary is the way in which young people first learn about the horrors of the Nazi genocide. Just as importantly, young readers understand that these crimes were visited upon a girl much like themselves and their friends -- a girl who was often in conflict with her mother, a girl who kept vowing to be a more patient and forgiving person, a girl who fell in love for the first time. A girl who wanted to be a writer -- and who was one.
He had a wide variety of other research interests. Among these was a fascination with heterochromia, a condition in which the irises of an individual's eyes differ in coloration. Throughout his stay in Auschwitz, Mengele collected the eyes of his murdered victims, in part to furnish “research material” to colleague Karin Magnussen, a KWI researcher of eye pigmentation. He himself also conducted several experiments in an attempt to unlock the secret of artificially changing eye color. He also zealously documented in camp inmates the progression of the disease Noma, a type of gangrene which destroys the mucous membrane of the mouth and other tissues.
Three defendants were acquitted. However, many of the Nazis who perpetrated the Holocaust were never tried or punished, including Hitler who had committed suicide. Since then, the international community has continued and improved accountability through forums such as the International Criminal Court, and the International Criminal Tribunal for Rwanda.
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.
After the German invasion of Czechoslovakia in 1939, the Nazis sent many thousands of Czech Jews to ghettos in Poland, Lithuania and Latvia. On 22 June 1941, the German invasion of the Soviet Union brought many more Jews within the German sphere of influence. Some Polish Jews had managed to escape into the Soviet Union during the German invasion of Poland. Now, as the German army rolled into the Soviet Union, they were again trapped.
 “I would do it all again.” Edeltrud Posiles uttered these words in 2011 when she was the last surviving Righteous Gentile who had hid Jews in Nazi Austria. When Posiles – then Becher – heard a knock on the door in 1942, she opened it to find her Jewish fiancé and his two brothers on her doorstep. As described at the, “Hiding Jews was punishable by death. But the feisty 94-year old [said] ‘there was never a moment’s doubt in my mind,’ when asked if she hesitated as she was asked by the brothers for sanctuary.”

Doubleday, meanwhile, sensing complications ahead, had withdrawn as Frank’s theatrical agent, finding Levin’s presence—injected by Frank—too intrusive, too maverick, too independent and entrepreneurial: fixed, they believed, only on his own interest, which was to stick to his insistence on the superiority of his work over all potential contenders. Frank, too, had begun—kindly, politely, and with tireless assurances of his gratitude to Levin—to move closer to Doubleday’s cooler views, especially as urged by Barbara Zimmerman. She was twenty-four years old, the age Anne would have been, very intelligent and attentive. Adoring letters flowed back and forth between them, Frank addressing her as “little Barbara” and “dearest little one.” On one occasion he gave her an antique gold pin. About Levin, Zimmerman finally concluded that he was “impossible to deal with in any terms, officially, legally, morally, personally”—a “compulsive neurotic . . . destroying both himself and Anne’s play.” (There was, of course, no such entity as “Anne’s play.”)
On the eve of World War II, the Führer (supreme leader) publicly threatened the Jews of Europe during a speech in Berlin: "In the course of my life I have very often been a prophet, and have usually been ridiculed for it. During the time of my struggle for power it was in the first instance only the Jewish race that received my prophecies with laughter when I said that I would one day take over the leadership of the State, and with it that of the whole nation, and that I would then among other things settle the Jewish problem. Their laughter was uproarious, but I think that for some time now they have been laughing on the other side of their face. Today I will once more be a prophet: if the international Jewish financiers in and outside Europe should succeed in plunging the nations once more into a world war, then the result will not be the Bolshevizing of the earth, and thus the victory of Jewry, but the annihilation of the Jewish race in Europe!"
The men selected April 15, the darkest night of the month, for the escape. Dogim, the unofficial leader of the group, was first—once he emerged from the tunnel, he would cut a hole in the nearby fence and mark it with a white cloth, so the others would know which direction to run. Farber was second. Motke Zeidel was sixth. The prisoners knew that a group of partisan fighters were holed up nearby, in the Rudnitsky Woods, in a secret camp from which they launched attacks on the Nazi occupiers. “Remember, there is no going back under any circumstances,” Farber reminded his friends. “It is better to die fighting, so just keep moving forward.”
In nearly every country overrun by the Nazis, the Jews were forced to wear badges marking them as Jews, they were rounded up into ghettos or concentration camps and then gradually transported to the killing centers. The death camps were essentially factories for murdering Jews. The Germans shipped thousands of Jews to them each day. Within a few hours of their arrival, the Jews had been stripped of their possessions and valuables, gassed to death, and their bodies burned in specially designed crematoriums. Approximately 3.5 million Jews were murdered in these death camps.

Twins were subjected to weekly examinations and measurements of their physical attributes by Mengele or one of his assistants.[49] The experiments he performed on twins included unnecessary amputation of limbs, intentionally infecting one twin with typhus or some other disease, and transfusing the blood of one twin into the other. Many of the victims died while undergoing these procedures,[50] and those who survived the experiments were sometimes killed and their bodies dissected once Mengele had no further use for them.[51] Nyiszli recalled one occasion on which Mengele personally killed fourteen twins in one night by injecting their hearts with chloroform.[31] If one twin died from disease, he would kill the other twin to allow comparative post-mortem reports to be produced for research purposes.[52]