After September 1939, with the beginning of the Second World War, concentration camps became places where millions of ordinary people were enslaved as part of the war effort, often starved, tortured and killed. During the War, new Nazi concentration camps for "undesirables" spread throughout the continent. According to statistics by the German Ministry of Justice, about 1,200 camps and subcamps were run in countries occupied by Nazi Germany, while theJewish Virtual Library estimates that the number of Nazis camps was closer to 15,000 in all of occupied Europe and that many of these camps were created for a limited time before being demolished. Camps were being created near the centers of dense populations, often focusing on areas with large communities of Jews, Polish intelligentsia, Communists or Roma. Since millions of Jews lived in pre-war Poland, most camps were located in the area ofGeneral Government in occupied Poland, for logistical reasons. The location also allowed the Nazis to quickly remove the German Jews from within the German proper. In 1942, the SS built a network of Extermination camps to systematically kill millions of prisoners by gassing. The extermination camps(Vernichtungslager) and death camps (Todeslager) were camps whose primary function was genocide. The Nazis themselves distinguished between concentration camps and the extermination camps. The British intelligence service had information about the concentration camps, and in 1942 Jan Karski delivered a thorough eyewitness account to the government.
Internees
The two largest groups containing prisoners in the camps, both numbering in the millions, were the Polish Jews and the Soviet prisoners of war (POWs) held without trial or judicial process. Large numbers of Roma (or Gypsies), ethnic Poles, political prisoners, homosexuals, people with disabilities, Jehovah's Witnesses, Catholic clergy, Eastern European intellectuals and others (including common criminals, as declared by the Nazis). In addition, a small number of Western Allied aviators were sent to concentration camps as spies. Western Allied POWs who were Jews, or whom the Nazis believed to be Jewish, were usually sent to ordinary POW camps; however, a small number were sent to concentration camps under antisemitic policies.
Sometimes the concentration camps were used to hold important prisoners, such as the generals involved in the attempted assassination of Hitler; U-boatCaptain-turned-Lutheran pastor Martin Niemöller; and Admiral Wilhelm Canaris, who was interned at Flossenbürg on February 7, 1945, until he was hanged on April 9, shortly before the war’s end.
In most camps, prisoners were forced to wear identifying overalls with colored badges according to their categorization: red triangles for Communists and other political prisoners, green triangles for common criminals, pink for homosexual men, purple for Jehovah's Witnesses, black for Gypsies and asocials, and yellow for Jews.
Treatment
After 1942, many small subcamps were set up near factories to provide forced labour. IG Farben established a synthetic rubber plant in 1942 at Monowitz concentration camp (Auschwitz III); other camps were set up next to airplane factories, coal mines and rocket propellant plants. Conditions were brutal and prisoners were often sent to the gas chambers or killed if they did not work quickly enough.
In the early spring of 1941, the SS – along with doctors and officials of the T-4 Euthanasia Program – introduced the Action 14f13 programme meant for extermination of selected concentration camp prisoners. The Inspectorate of the Concentration Camps categorized all files dealing with the death of prisoners as 14f, and those of prisoners sent to the T-4 gas chambers as 14f13. Under the language regulations of the SS, selected prisoners were designated for "special treatment (German: Sonderbehandlung) 14f13". Prisoners were officially selected based on their medical condition; namely, those permanently unfit for labor due to illness. Unofficially, racial and eugenic criteria were used: Jews, the handicapped, and those with criminal or antisocialrecords were selected. For Jewish prisoners there was not even the pretense of a medical examination: the arrest record was listed as a physician’s “diagnosis”. In early 1943, as the need for labor increased and the gas chambers at Auschwitz became operational, Heinrich Himmler ordered the end of Action 14f13.Many of the prisoners died in the concentration camps through deliberate maltreatment, disease, starvation, and overwork, or were executed as unfit for labor. Prisoners were transported in inhumane conditions by rail freight cars, in which many died before reaching their destination. The prisoners were confined to the boxcars for days or even weeks, with little or no food or water. Many died of dehydration in the intense heat of summer or froze to death in winter. Concentration camps also existed in Germany itself, and while they were not specifically designed for systematic extermination, many of their inmates perished because of harsh conditions or were executed.
After much consideration, the extermination of the Jewish prisoners (the “Final Solution”) was announced to high ranking officials at the Wannsee Conferencein 1942.
Towards the end of the war, the camps became sites for medical experiments. Eugenics experiments, freezing prisoners to determine how downed pilots were affected by exposure, and experimental and lethal medicines were all tried at various camps. Female prisoners were routinely raped and degraded in the camps.
