Approximately a half million Gypsies (a dark-skinned, Caucasian ethnic group targeted by the Nazis) were murdered out of approximately 1.6 million who were living in Europe. The Gypsies in Germany and the occupied territories of the German War machine were subjected to many of the same persecutions as the Jews: restrictive, discriminatory laws, isolation and internment, and mass executions at their camp sites, in labor camps and death camps.

According to the drawings done by Walter Dejaco, one of the architects of the Krema II building, the original blueprint showed a corpse slide for rolling bodies down into the vestibule between the two morgues, which were later converted into an undressing room and a gas chamber. The corpse slide was never built. Dejaco was acquitted by a court in Austria in 1972; at his trial, the drawings of the corpse slide were entered as evidence. (The morgue at the Sachsenhausen camp has a corpse slide which can still be seen today.)

Germany invaded the Soviet Union in June 1941.[236] German propaganda portrayed the war against the Soviet Union as both an ideological war between German National Socialism and Jewish Bolshevism and a racial war between the Germans and the Jewish, Romani and Slavic Untermenschen ("sub-humans").[237] Local populations in some occupied Soviet territories actively participated in the killing of Jews and others, and helped identify and round up Jews.[238] German involvement ranged from active instigation and involvement to general guidance.[239] In Lithuania, Latvia, and western Ukraine, locals were deeply involved in the murder of Jews from the beginning of the German occupation. Some of these Latvian and Lithuanian units also participated in the murder of Jews in Belarus. In the south, Ukrainians killed about 24,000 Jews and some went to Poland to serve as concentration and death-camp guards.[238] Military units from some countries allied to Germany also killed Jews. Romanian units were given orders to exterminate and wipe out Jews in areas they controlled.[240] Ustaše militia in Croatia persecuted and murdered Jews, among others.[168] Many of the killings were carried out in public, a change from previous practice.[241]
The digging got underway the first night in February 1944, in a storeroom at the back of the bunker. To disguise their efforts, the prisoners erected a fake wall over the tunnel’s entrance, with “two boards hanging on loose nails that would come out with a good tug, making it possible to pass through,” Farber recalled in The Complete Black Book of Russian Jewry, a compilation of eyewitness testimonies, letters and other documents of the Nazi campaign against Jews in Eastern Europe published in part in 1944 and translated into English in 2001.
Amit withstood pressure from many members of his staff who were Holocaust survivors or relatives of victims. But others thought he was right. Rafi Eitan, an Israel-born Mossad operative who led the team that caught Eichmann, told me: “Because of the need for foreign-language speakers, many of the Mossad’s recruits were from Europe, and therefore had gone through the Holocaust or lost their families in it. One can definitely understand their need for vengeance. However, there was huge pressure to deal with current requirements, and with the resources being as meager as they were, in no way would it have been right to give the Nazi matter priority.”
As reported in The New York Times in 2015, "When Otto Frank first published his daughter's red-checked diary and notebooks, he wrote a prologue assuring readers that the book mostly contained her words".[53] Although many Holocaust deniers, such as Robert Faurisson, have claimed that Anne Frank's diary was fabricated,[54][55] critical and forensic studies of the text and the original manuscript have supported its authenticity.[56]
The Nazi invasion of the Soviet Union codenamed Operation Barbarossa, which commenced on 22 June 1941, set in motion a "war of destruction" which quickly opened the door to systematic mass murder of European Jews.[30] For Hitler, Bolshevism was merely "the most recent and most nefarious manifestation of the eternal Jewish threat".[31] On 3 March 1941, Wehrmacht Joint Operations Staff Chief Alfred Jodl repeated Hitler's declaration that the "Jewish-Bolshevik intelligentsia would have to be eliminated" and that the forthcoming war would be a confrontation between two completely opposing cultures.[32] In May 1941, Gestapo leader Heinrich Müller wrote a preamble to the new law limiting the jurisdiction of military courts in prosecuting troops for criminal actions because: "This time, the troops will encounter an especially dangerous element from the civilian population, and therefore, have the right and obligation to secure themselves."[33]
To come to the diary without having earlier assimilated Elie Wiesel’s “Night” and Primo Levi’s “The Drowned and the Saved” (to mention two witnesses only), or the columns of figures in the transport books, is to allow oneself to stew in an implausible and ugly innocence. The litany of blurbs—“a lasting testament to the indestructible nobility of the human spirit,” “an everlasting source of courage and inspiration”—is no more substantial than any other display of self-delusion. The success—the triumph—of Bergen-Belsen was precisely that it blotted out the possibility of courage, that it proved to be a lasting testament to the human spirit’s easy destructibility. “Hier ist kein Warum,” a guard at Auschwitz warned: here there is no “why,” neither question nor answer, only the dark of unreason. Anne Frank’s story, truthfully told, is unredeemed and unredeemable.
In the last months of Hitler’s Reich, as the German armies retreated, the Nazis began marching the prisoners still alive in the concentration camps to the territory they still controlled. The Germans forced the starving and sick Jews to walk hundreds of miles. Most died or were shot along the way. About a quarter of a million Jews died on the death marches.

According to the drawings done by Walter Dejaco, one of the architects of the Krema II building, the original blueprint showed a corpse slide for rolling bodies down into the vestibule between the two morgues, which were later converted into an undressing room and a gas chamber. The corpse slide was never built. Dejaco was acquitted by a court in Austria in 1972; at his trial, the drawings of the corpse slide were entered as evidence. (The morgue at the Sachsenhausen camp has a corpse slide which can still be seen today.)
Hilberg, Raul (1985). The Destruction of the European Jews: The Revised and Definitive Edition. New York: Holmes and Meier. ISBN 0-8419-0832-X – via search inside. The deportations ... were the work of a much larger apparatus that had to deal with a host of constraints and requirements. The effort, as we shall see, was deemed necessary to accomplish the Final Solution on a European-wide scale.[p.273] 
To murder the Jews of "Greater Germany" as well as Jews residing in German-occupied or German-influenced areas of western, southern, southeastern and northern Europe, Himmler designated Auschwitz II (Auschwitz-Birkenau) in the spring of 1942 as a killing facility. Auschwitz-Birkenau, along with the Auschwitz main camp, was subordinated to the Inspectorate of Concentration Camps in Berlin. Originally planned as a vast forced-labor camp for Soviet prisoners of war and, later for Jewish forced laborers, Auschwitz-Birkenau began to operate as a killing center in the spring of 1942. The SS authorities murdered approximately one million Jews from various European countries at Auschwitz-Birkenau, including Jews from Germany, Austria, Czechoslovakia, Norway, France, the Netherlands, Belgium, Luxemburg, German-occupied western and southwestern Poland, Yugoslavia, Greece, Italy, and Hungary.
Twins in the experiments describe three days of what must have been psychological examination and three days of laboratory experiments. "Three times a week we were marched to Auschwitz to a big brick building, sort of like a big gymnasium. They would keep us there for about six or eight hours at a time - most of the days. ..... We would have to sit naked in the large room where we first entered, and people in white jackets would observe us and write down notes. They also would study every part of our bodies. They would photograph, measure our heads and arms and bodies, and compare the measurements of one twin to another. The process seemed to go on and on." (Echoes from Auschwitz, Kor).
Which made him all the more intrigued to hear, two years ago, about a new research project led by Jon Seligman, of the Israel Antiquities Authority, at the site of Vilnius’s Great Synagogue, a once towering Renaissance-Baroque structure dating to the 1630s. The synagogue, which had also housed a vast library, kosher meat stalls and a communal well, had at one time been the crown jewel of the city, itself a center of Jewish life in Eastern Europe—the “Jerusalem of the North.” By one estimate, at the turn of the 20th century Vilnius was home to some 200,000 people, half of them Jewish. But the synagogue was damaged after Hitler’s army captured the city in June 1941 and herded the Jewish population into a pair of walled ghettos, whom it then sent, in successive waves, to Ponar. After the war the Soviets razed the synagogue entirely; today an elementary school stands in its place.
During the era of the Holocaust, German authorities also targeted other groups because of their perceived racial and biological inferiority: Roma (Gypsies), people with disabilities, and some of the Slavic peoples (Poles, Russians, and others). Other groups were persecuted on political, ideological, and behavioral grounds, among them Communists, Socialists, Jehovah's Witnesses, and homosexuals.
They set off at 11 p.m., in groups of ten. The first group emerged from the tunnel without incident. Zeidel recalled slithering on his stomach toward the edge of the camp. He scarcely dared to exhale; his heart slammed against his chest wall. Later, Farber would speculate that it was the snap of a twig that alerted their captors to the escape. Dogim attributed it to a blur of movement spotted by the guards.
In 1942, Auschwitz II (Birkenau), originally intended to house slave laborers, began to be used instead as a combined labor camp and extermination camp.[23][24] Prisoners were transported there by rail from all over German-occupied Europe, arriving in daily convoys.[25] By July 1942, SS doctors were conducting "selections" where incoming Jews were segregated, and those considered able to work were admitted into the camp while those deemed unfit for labor were immediately killed in the gas chambers.[26] The arrivals that were selected to die, about three-quarters of the total,[a] included almost all children, women with small children, pregnant women, all the elderly, and all of those who appeared (in a brief and superficial inspection by an SS doctor) to be not completely fit and healthy.[28][29]