It is estimated that at least 3.3 million Soviet POWs died in Nazi custody, out of 5.7 million. This figure represents a total of 57% of all Soviet POWs and may be contrasted with 8,300 out of 231,000 British and U.S. prisoners, or 3.6%. About 5% of the Soviet prisoners who died were Jews. The most deaths took place between June 1941 and January 1942, when the Germans killed an estimated 2.8 million Soviet POWs primarily through deliberate starvation,exposure, and summary execution. A million at most had been released, most of whom were so-called ‘volunteers’ (Hilfswillige) for (often compulsory) auxiliary service in the Wehrmacht, 500,000 had fled or were liberated, the remaining 3.3 million had perished as POWs.
The figure of 3.3 million POW dead is based on German figures and analysis. Data published in Russia presents a different view of their POW dead. Viktor Zemskov estimated Soviet POW deaths at 2.3 million; he published statistics that put Soviet POW losses at 2,471,000 (5,734,000 were captured, 821,000 were released for German military service, 72,000 escaped and 2,371,000 liberated ). Of the 823,000 POWS released for service in the German military forces 212,400 were killed or missing, 436,600 were returned to the USSR and imprisoned and 180,000 remained in western countries after the war.  Russian military historian Grigori F. Krivosheev maintained POW and MIA losses of the combat forces were actually 1.783 million, according to Krivosheev the higher figures of dead includes reservists not on active strength, civilians and military personnel who were captured during the course of the war.
By September 1941, the mortality rate among Soviet POWs was in the order of 1% per day. According to the United States Holocaust Memorial Museum (USHMM), by the winter of 1941, "starvation and disease resulted in mass death of unimaginable proportions". This deliberate starvation, despite food being available, led many desperate prisoners to resort to acts of cannibalism, was Nazi policy, and was all in accordance with the Hunger Plan developed by the Reich Minister of Food Herbert Backe. For the Germans, Soviet POWs were expendable: they consumed calories needed by others and, unlike Western POWs, were considered to be subhuman.
The Commissar Order (German: Kommissarbefehl) was a written order given by the German High Command (OKW) on 6 June 1941, prior to the beginning of Operation Barbarossa (German invasion of the Soviet Union). It demanded that any Soviet political commissar identified among captured troops be shot immediately. Those prisoners who could be identified as "thoroughly bolshevized or as active representatives of the Bolshevist ideology" were also to be executed.
General internment system for Soviet prisoners of war
In the summer and autumn of 1941, vast numbers of Soviet prisoners were captured in about a dozen large encirclements. Due to their rapid advance into the Soviet Union and an anticipated quick victory, the Germans did not want to ship these prisoners to Germany. Under the administration of the Wehrmacht, the prisoners were processed, guarded, forced-marched, or transported in open rail cars to locations mostly in the occupied Soviet Union, Germany, and occupied Poland. Much like comparable events, such as the Pacific War's Bataan Death March in 1942, the treatment of prisoners was brutal, without much in the way of supporting logistics.
Soviet prisoners of war were stripped of their supplies and clothing by poorly-equipped German troops when the cold weather set in; this resulted in death for the prisoners. Most of the camps for Soviet POWs were simply open areas fenced off with barbed wire and watchtowers with no inmate housing. These meager conditions forced the crowded prisoners to live in holes they had dug for themselves, which were exposed to the elements. Beatings and other abuse by the guards were common, and prisoners were malnourished, often consuming only a few hundred calories or less per day. Medical treatment was non-existent and an International Red Cross offer to help in 1941 was rejected by Hitler.
The camps established especially for Soviet POWs were called Russenlager ("Russian camp"). The Alliedregulars kept by Germany were usually treated in accordance with the 1929 Geneva Convention on Prisoners of War. Although the Soviet Union was not a signatory, Germany was, and Article 82 of the Convention required signatories to treat all captured enemy soldiers "as between the belligerents who are parties thereto." Russenlager conditions were often even worse than those commonly experienced by prisoners in regular concentration camps. Such camps included:
Oflag IV-C: Allied officers from Western countries at Colditz Castle were forbidden to share Red Cross packages with starving Soviet prisoners.
Oflag XIII-D: In July 1941 a new compound was set up in Oflag XIII-A for higher ranking Soviet military officers captured during Operation Barbarossa. It was closed in April 1942 and the surviving officers (many had died during the winter due to an epidemic) were transferred to other camps.
Stalag 324: 28,444 Soviet POWs were held at this camp near Grady
Stalag 328: 41,012 Soviet POWs were held at this camp near Lwów
Stalag 350/Z: According to a 1944 Soviet report, 43,000 captured Red Army personnel were either killed or died from diseases and starvation at this camp near Riga. The prisoners were used for the construction of Salaspils concentration camp in October 1941.
Stalag I-B: Tens of thousands of prisoners died in the camp, the vast majority of them Soviets.
Stalag II-B: The construction of the second camp, Lager-Ost, started in June 1941 to accommodate the huge numbers of Soviet prisoners taken in Operation Barbarossa. In November 1941 a typhoid fever epidemic broke out in the Lager-Ost which went on until March 1942. A total of 38,383 Soviet POWs were held Stalag II B.
Stalag III-A: Mortality rates of Soviet prisoners were extremely high compared to the POWs of other nations, including around 2,000-2,500 Soviets who died in a typhus outbreak during the winter of 1941-42. While non-Soviet prisoners were buried with military honours in individual graves at the camp cemetery, Soviet dead were buried anonymously in mass graves.
Stalag III-C: When Soviet prisoners captured during Operation Barbarossa arrived in July 1941 they were held in separate zones and suffered severe conditions and disease. The majority of these prisoners (up to 12,000) were killed, starved to death or died from disease.
Stalag IV-A: In June–September 1941 Soviet prisoners from Operation Barbarossa were placed in another camp. Conditions were appalling, and starvation, epidemics and ill-treatment took a heavy toll of lives; the dead Soviet prisoners were buried in mass graves.
Stalag IV-B: In July 1941 about 11,000 Soviet soldiers, and some officers, arrived. By April 1942 only 3,279 remained; the rest had died from malnutrition and a typhus epidemic caused by the deplorable sanitary conditions. Their bodies were buried in mass graves. After April 1942 more Soviet prisoners arrived and died just as rapidly. At the end of 1942, 10,000 reasonably healthy Soviet prisoners were transferred to work in Belgian coal mines; the rest, suffering from tuberculosis, continued to die at the rate of 10–20 per day.
Stalag V-A: During 1941–1942 many Soviet POWs arrived but they were kept in separate enclosures and received much harsher treatment than the other prisoners. Thousands of them died of malnutrition and disease.
Stalag VI-C: Over 2,000 Soviet prisoners from Operation Barbarossa arrived in the summer of 1941. Conditions were appalling and starvation, epidemics and ill-treatment took a heavy toll of lives. The dead were buried in mass graves.
Stalag VI-K (Stalag 326): Between 40,000 and 60,000 prisoners died, mostly buried in three mass graves. A Soviet war cemetery is still in existence, containing about 200 named graves.
Stalag VII-A: During five years about 1,000 prisoners died at the camp, over 800 of them Soviets (mostly officers). At the end of the war there were still 27 Soviet Army generals in the camp who had survived the mistreatment that they, like all Soviet prisoners, had been subjected to. The new prisoners were inspected upon arrival by local Munich Gestapo agents; some 484 were found to be "undesirable" and immediately sent to concentration camps and murdered.
Stalag VIII-C: 29,436 prisoners were held at this camp. Conditions were appalling and starvation, epidemics and ill-treatment took a heavy toll of lives. By early 1942 the survivors had been transferred to other camps.
Stalag XI-D (Stalag 321): In July 1941, over 10,000 Soviet army officers were imprisoned in a new sub-camp of Stalag XI-B. Thousands of them died in the winter of 1941-42 as the result of a typhoid fever epidemic.
Stalag XI-C: In July 1941, about 20,000 Soviet prisoners captured during Operation Barbarossa arrived; they were housed in the open while huts were being built. Some 14,000 POWs died during the winter of 1941–42. In late 1943 the POW camp was closed and the entire facility became Bergen-Belsen concentration camp.
In the "weeding-out actions" (Aussonderungsaktionen) of 1941–42, the Gestapo secret police further identified Communist Party and state officials, commissars, academic scholars, Jews and other "undesirable" or "dangerous" individuals who had survived the Commissar Order selections, and transferred them to concentration camps, where they were summarily executed. At Stalag VII-A at Moosburg, Major Karl Meinel objected to these executions, but the SS (including Karl von Eberstein) intervened, Meinel was demoted to reserve, and the killing continued.
In all, between June 1941 and May 1944 about 10% of all Soviet POWs were turned over to the SS-Totenkopfverbände concentration camp organization or the Einsatzgruppen death squads and murdered. Einsatzgruppen killings included the Babi Yar massacres where Soviet POWs were among 70,000–120,000 people executed between 1941 and 1943 and the Ponary massacre that included the execution of some 7,500 Soviet POWs in 1941 (among about 100,000 murdered there between 1941 and 1944).
Soviet prisoners of war in German concentration and extermination camps
Naked Soviet prisoners of war in Mauthausen concentration camp. Unknown date
Between 140,000 and 500,000 Soviet prisoners of war died or were executed in Nazi concentration camps. Most of those executed were killed by shooting but some were gassed.
Auschwitz-Birkenau concentration camp: about 15,000 Soviet POWs who were brought to Auschwitz I for work, only 92 remained alive at the last roll call. About 3,000 more were killed by being shot or gassed immediately after arriving. Out of the first 10,000 brought to work in 1941, 9,000 died in the first five months. A group of about 600 Soviet prisoners were gassed in the first Zyklon-B experiments on September 3, 1941; in December 1941, a further 900 Soviet POWs were murdered by means of gas. In March 1941, the SS chief Heinrich Himmler ordered the construction of a large camp for 100,000 Soviet POWs at Birkenau, in close proximity to the main camp. Most of the Soviet prisoners were dead by the time Birkenau was reclassified as the Auschwitz II concentration camp in March 1942.
Flossenbürg concentration camp: More than 1,000 Soviet POWs had been executed in Flossenbürg by the end of 1941; executions continued sporadically up to 1944. The POWs at one of the sub-camps staged a failed uprising and mass escape attempt on May 1, 1944. The SS also established a special camp for 2,000 Soviet POWs within Flossenbürg itself.
Gross-Rosen concentration camp: 65,000 Soviet POWs were killed by feeding them only a thin soup of grass, water, and salt for six months. In October 1941 the SS transferred about 3,000 Soviet POWs to Gross-Rosen for execution by shooting.
Majdanek concentration camp: The first transport directed toward Majdanek consisted of 5,000 Soviet POWs arriving in the latter half of 1941, they soon died of starvation and exposure. Executions were also conducted there by the shooting of prisoners in trenches.
Mauthausen-Gusen concentration camp: Following the outbreak of the Soviet–German War the camps started to receive a large number of Soviet POWs; most of them were kept in huts separated from the rest of the camp. Soviet POWs were a major part of the first groups to be gassed in the newly built gas chamber in early 1942; at least 2,843 of them were murdered in the camp. According to the USHMM, "so many POWs were shot that the local population complained that their water supply had been contaminated. The rivers and streams near the camp ran red with blood."
Sachsenhausen concentration camp: Soviet POWs were victims of the largest part of the executions that took place. Thousands of them were murdered immediately after arriving at the camp, including 9,090 executed between August 31 and October 2, 1941. Among those who died there was Lt. Yakov Dzhugashvili, the elder son of Joseph Stalin (either by suicide or shot).
Sobibór extermination camp: Soviet POWs of Jewish ethnicity were among hundreds of thousands people gassed at Sobibór. A group of captive Soviet officers led by 2nd Lt. Alexander Pechersky organized a successful mass breakout from Sobibor, after which the SS closed and dismantled the camp.
Soviet prisoners of war in German slave labour system
In January 1942, Hitler authorized better treatment of Soviet POWs because the war had bogged down, and German leaders decided to use prisoners for forced labour on a large scale (see forced labour under German rule during World War II). Their number increased from barely 150,000 in 1942, to the peak of 631,000 in the summer of 1944. Many were dispatched to the coal mines (between July 1 and November 10, 1943, 27,638 Soviet POWs died in the Ruhr Area alone), while others were sent to Krupp, Daimler-Benz or other companies, where they provided labour while often being slowly worked to death. The largest "employers" of 1944 were mining (160,000), agriculture (138,000) and the metal industry (131,000). No less than 200,000 prisoners died during forced labour.
The Organisation Todt was a civil and military engineering group in Germany eponymously named for its founder Fritz Todt. The organisation was responsible for a wide range of engineering projects both in pre-World War II Germany, and in Germany itself and occupied territories from France to the Soviet Union during the war, and became notorious for using forced labour. Most of the so-called "volunteer" Soviet POW workers were consumed by the Organisation Todt. The period from 1942 until the end of the war had approximately 1.4 million labourers in the service of the Organisation Todt. Overall, 1% were Germans rejected from military service and 1.5% were concentration camp prisoners; the rest were prisoners of war and compulsory labourers from occupied countries. All non-Germans were effectively treated as slaves and many did not survive the work or the war.
^ abPeter Calvocoressi, Guy Wint, Total War — "The total number of prisoners taken by the German armies in the USSR was in the region of 5.7 million. Of these, the astounding number of 3.5 million or more had been lost by the middle of 1944 and the assumption must be that they were either deliberately killed or done to death by criminal negligence. Nearly two million of them died in camps and close on another million disappeared while in military custody either in the USSR or in rear areas; a further quarter of a million disappeared or died in transit between the front and destinations in the rear; another 473,000 died or were killed in military custody in Germany or Poland."
They add, "This slaughter of prisoners cannot be accounted for by the peculiar chaos of the war in the east. ... The true cause was the inhuman policy of the Nazis towards the Russians as a people and the acquiescence of army commanders in attitudes and conditions which amounted to a sentence of death on their prisoners."
^ abcChristian Streit: Keine Kameraden: Die Wehrmacht und die Sowjetischen Kriegsgefangenen, 1941–1945, Bonn: Dietz (3. Aufl., 1. Aufl. 1978), ISBN3-8012-5016-4 — "Between 22 June 1941 and the end of the war, roughly 5.7 million members of the Red Army fell into German hands. In January 1945, 930,000 were still in German camps. A million at most had been released, most of whom were so-called ‘volunteers’ (Hilfswillige) for (often compulsory) auxiliary service in the Wehrmacht. Another 500,000, as estimated by the Army High Command, had either fled or been liberated. The remaining 3,300,000 (57.5 percent of the total) had perished."
^Nazi persecution of Soviet Prisoners of War United States Holocaust Memorial Museum — "Existing sources suggest that some 5.7 million Soviet army personnel fell into German hands during World War II. As of January 1945, the German army reported that only about 930,000 Soviet POWs remained in German custody. The German army released about one million Soviet POWs as auxiliaries of the German army and the SS. About half a million Soviet POWs had escaped German custody or had been liberated by the Soviet army as it advanced westward through eastern Europe into Germany. The remaining 3.3 million, or about 57 percent of those taken prisoner, were dead by the end of the war."
^Daniel Goldhagen, Hitler's Willing Executioners (pg. 290) — "2.8 million young, healthy Soviet POWs" killed by the Germans, "mainly by starvation ... in less than eight months" of 1941–42, before "the decimation of Soviet POWs ... was stopped" and the Germans "began to use them as laborers" (emphasis added).
^Michael Burleigh (1997). Ethics and extermination: reflections on Nazi genocide. Cambridge University Press. p. 71. ISBN978-0-521-58816-4. Retrieved 20 March 2011. Inhumane treatment of Soviet prisoners included proceedings at Shitomir in August 1941 where a group of them were shot with captured Red Army dum-dum bullets so that German military doctors could precisely observe, and write up, the effects of these munitions upon the human body.95(See Streim reference below for original source).