Righteous Among the Nations (Hebrew: חֲסִידֵי אֻמּוֹת הָעוֹלָם, khasidei umót ha'olám "righteous (plural) of the world's nations") is an honorific used by the State of Israel to describe non-Jews who risked their lives during the Holocaust to save Jews from extermination by the Nazis. The term originates with the concept of "righteous gentiles", a term used in rabbinic Judaism to refer to non-Jews, called ger toshav, who abide by the Seven Laws of Noah.
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]

Unlike concentration camps, death camps had no barracks to house prisoners, other than those for workers at the camps. In order to process the murder of thousands of people, great pains were taken to deceive the victims concerning their fate. Jews deported from ghettos and concentration camps to the death camps were unaware of what they were facing. The Nazi planners of the operation told the victims that they were being resettled for labor, issued them work permits, told them to bring along their tools and to exchange their German marks for foreign currency. Food was also used to coax starving Jews onto the trains. Once the trains arrived at the death camps, trucks were available to transport those who were too weak to walk directly to the gas chambers. The others were told that they would have to be deloused and enter the baths. The victims were separated by sex and told to remove their clothes. The baths were in reality the gas chambers. The shower heads in the baths were actually the inlets for poison gas. At Auschwitz, the gas chambers held 2,000 people at a time. With the introduction of a cyanide-based gas called Zyklon B, all 2,000 occupants could be killed in five minutes. As a result of this technological “advancement,” Auschwitz was able to “process” the death of 12,000 victims daily. Before the bodies were removed by workers with gas masks and burned in crematoria, the teeth of the victims were stripped for gold, which was melted down and shipped back to Germany. Innocent victims were exploited and desecrated to a degree unknown in human history.
At the same time, the Germans set about liquidating the ghettos in occupied Poland. July 22, 1942, when the deportation of Jews from Warsaw to the death camp in Treblinka began, is regarded as a symbolic date. A decided majority of the Polish Jews were killed in a little over half a year, after which the SS began liquidating the Aktion Reinhard camps. However, the last great death camp—Auschwitz—remained in existence until the beginning of 1945. It was mainly Jews from Western and Southern Europe, from the liquidated labor camps, and the ghettos in Sosnowiec and Łódź, who died in the gas chambers there.

By now, experimental mobile gas vans were being used by the Einsatzgruppen to kill Jews in Russia. Special trucks had been converted by the SS into portable gas chambers. Jews were locked up in the air-tight rear container while exhaust fumes from the truck's engine were fed in to suffocate them. However, this method was found to be somewhat impractical since the average capacity was less than 50 persons. For the time being, the quickest killing method continued to be mass shootings. And as Hitler's troops advanced deep into the Soviet Union, the pace of Einsatz killings accelerated. Over 33,000 Jews in the Ukraine were shot in the Babi Yar ravine near Kiev during two days in September 1941.
In 1942, fifteen Nazi leaders met at a conference in Wannsee, Germany to discuss the “Jewish Question”. Their job was to decide the most efficient way to exterminate the Jews. They decided that Jews would be sent to extermination camps where they would be sent to showers. But instead of water coming out of the faucet, they faced their death when poisonous Zyklon-B gas leaked through the showerheads to suffocate them. This decision at the conference is called the “Final Solution.”
Eichmann received various levels of cooperation from each of the various occupied governments. But in countries such as Holland, Belgium, Albania, Denmark, Finland and Bulgaria, some Jews were saved from their deaths by the action of the sympathetic populace and government officials. Denmark’s government and populace were exemplary in their heroism in saving Jews. In other countries such as Poland, Greece, France, and Yugoslavia, the deportation of Jews to the death camps was facilitated by the cooperation of the government.

It is not clear which of the four gas chambers at Birkenau that Litwinska was referring to. The Krema IV and Krema V gas chambers were on the ground floor and had "small windows high up near the roof" where the gas pellets were thrown in by the SS men. But neither of these two gas chambers had a "gas chamber chute" for dumping the victims into the gas chamber from "tipper-type lorries," which Americans would call dump trucks.

Timothy Snyder writes that Longerich "grants the significance of Greiser's murder of Jews by gas at Chełmno in December 1941", but also detects a significant moment of escalation in spring 1942, which includes "the construction of the large death factory at Treblinka for the destruction of the Warsaw Jews, and the addition of a gas chamber to the concentration camp at Auschwitz for the murder of the Jews of Silesia".[117] Longerich suggests that it "was only in the summer of 1942, that mass killing was finally understood as the realization of the Final Solution, rather than as an extensively violent preliminary to some later program of slave labor and deportation to the lands of a conquered USSR". For Longerich, to see mass killing as the Final Solution was an acknowledgement by the Nazi leadership that there would not be a German military victory over the USSR in the near future.[117]

Wallenberg was a Swedish diplomat who helped save thousands of Hungarian Jews. Wallenberg provided thousands of Jews with special Swedish passports and also set up a bureaucracy in Budapest designed to protect Jews by using "safe houses" where they could receive food and medical supplies. More than 90,000 Budapest Jews were deported to death camps; Wallenberg's efforts may have saved an equal number. Following the liberation of Budapest, Wallenberg was arrested by the Soviets and was never heard from again.

If only Anne Frank's diary was the figment of someone's imagination. If it meant that this spirited, intelligent and articulate girl hadn't died along with so many others in Belsen concentration camp, and that the holocaust had never happened, that would be a wonderful thing, but it did happen, and that makes the reading of this diary even more heartbreaking.
Almost all Jews within areas occupied by the Germans were killed. There were 3,020,000 Jews in the Soviet Union in 1939, and the losses were 1–1.1 million.[400] Around one million Jews were killed by the Einsatzgruppen in the occupied Soviet territories.[401][402] Of Poland's 3.3 million Jews, about 90 percent were killed.[369] Many more died in the ghettos of Poland before they could be deported.[403] The death camps accounted for half the number of Jews killed; 80–90 percent of death-camp victims are estimated to have been Jews.[394] At Auschwitz-Birkenau the Jewish death toll was 1.1 million;[286][404] Treblinka 870,000–925,000;[405] Bełżec 434,000–600,000;[406][287] Chełmno 152,000–320,000;[407][288] Sobibór 170,000–250,000;[408][291] and Majdanek 79,000.[289]
The Soviet Army reached Auschwitz on January 27, 1945. By that time, an estimated 1,500,000 Jews, along with 500,000 Polish prisoners, Soviet POWs and Gypsies, had perished there. As the Western Allies pushed into Germany in the spring of 1945, they liberated Buchenwald, Bergen-Belsen, and Dachau. Now the full horror of the twelve-year Nazi regime became apparent as British and American soldiers, including Supreme Commander Dwight D. Eisenhower, viewed piles of emaciated corpses and listened to vivid accounts given by survivors.
While these massacres were happening, the Nazis elsewhere were laying plans for an overall 'solution to the Jewish question'. Death camp operations began in December 1941 at Semlin in Serbia and Chelmno in Poland, where people were killed by exhaust fumes in specially modified vans, which were then driven to nearby sites where the bodies were plundered and burnt. 250,000 Jews were killed this way at Chelmno and 15,000 at Semlin.
In June 1941, Mengele was posted to Ukraine, where he was awarded the Iron Cross 2nd Class. In January 1942, he joined the 5th SS Panzer Division Wiking as a battalion medical officer. After rescuing two German soldiers from a burning tank, he was decorated with the Iron Cross 1st Class, the Wound Badge in Black, and the Medal for the Care of the German People. He was declared unfit for further active service in mid-1942, when he was seriously wounded in action near Rostov-on-Don. Following his recovery, he was transferred to the headquarters of the SS Race and Settlement Main Office in Berlin, at which point he resumed his association with von Verschuer, who was now director of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics. Mengele was promoted to the rank of SS-Hauptsturmführer (captain) in April 1943.[20][21][22]