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Concentration camps and slave work

The Holocaust was the killing of approximately six million European Jews, as well as six million others who were deemed "unworthy of life" (including the disabled and mentally ill, Soviet POWs, homosexuals, Freemasons, Jehovah's Witnesses, and the Roma) as part of a program of deliberate extermination planned and executed by the National Socialist government in Germany led by Adolf Hitler. About 12 million forced laborers, most of whom were Eastern Europeans, were employed in the German war economy inside the Nazi Germany.

In addition to the Nazi concentration camps, the Soviet Gulag, or labor camps, led to the death of citizens of occupied countries such as Poland, Lithuania, Latvia, and Estonia, as well as German prisoners of war (POW) and even Soviet citizens themselves who had been or were thought to be supporters of the Nazis.  Sixty percent of Soviet POWs died during the war.  Vadim Erlikman estimates the number at 2.6 million Soviet POWs that died in German Captivity.   Richard Overy gives the number of 5.7 million Soviet POWs. Of those, 57% died or were killed, a total of 3.6 million.  The survivors on their return to the USSR were treated as traitors (see Order No. 270).

Body disposal at Unit 731, the infamous Japanese biological warfare research unit.Japanese POW camps also had high death rates, many were used as labour camps. According to the findings of the Tokyo tribunal, the death rate of Western prisoners was 27.1% (American POWs died at a rate of 37%),  seven times that of POW's under the Germans and Italians[157] The death rate of Chinese was much larger as, according to the directive ratified on 5 August 1937 by Hirohito, the constraints of international law were removed on those prisoners.  Thus, if 37,583 prisoners from the UK, 28,500 from Netherlands and 14,473 from USA were released after the surrender of Japan, the number for the Chinese was only 56.

According to a joint study of historians featuring Zhifen Ju, Mark Peattie, Toru Kubo, and Mitsuyoshi Himeta, more than 10 million Chinese were mobilized by the Japanese army and enslaved by the Koa-in for slave labor in Manchukuo and north China.[160] The U.S. Library of Congress estimates that in Java, between 4 and 10 million romusha (Japanese: "manual laborer"), were forced to work by the Japanese military. About 270,000 of these Javanese laborers were sent to other Japanese-held areas in South East Asia. Only 52,000 were repatriated to Java, meaning that there was a death rate of 80%.[161] According to Mitsuyoshi Himeta, at least 2.7 million died during the Sanko Sakusen implemented in Heipei and Shantung by General Yasuji Okamura.

Mistreated and starved prisoners in the Mauthausen camp, Austria, 1945.On February 19, 1942, Roosevelt signed Executive Order 9066, interning thousands of Japanese, Italians, German Americans, and some emigrants from Hawaii who fled after the bombing of Pearl Harbor for the duration of the war. 150,000 Japanese-Americans were interned by the U.S. and Canadian governments, as well as nearly 11,000 German and Italian residents of the U.S.

Allied use of slave labor occurred mainly in the east, such as in Poland[2], but more than a million was also put to work in the west. By December 1945 it was estimated by French authorities that 2,000 German prisoners were being killed or maimed each month in mine-clearing accidents.

Chemical and bacteriological weapons

Despite the international treaties and a resolution adopted by the League of Nations on 14 May 1938 condemning the use of toxic gas by Japan, the Imperial Japanese Army frequently used chemical weapons. Because of fears of retaliation, however, those weapons were never used against Westerners but only against other Asians judged "inferior" by the imperial propaganda. According to historians Yoshiaki Yoshimi and Seiya Matsuno, the authorization for the use of chemical weapons was given by specific orders (rinsanmei) issued by Hirohito himself. For example, the Emperor authorized the use of toxic gas on 375 separate occasions during the invasion of Wuhan, from August to October 1938.

The biological weapons were experimented on human beings by many units incorporated in the Japanese army, such as the infamous Unit 731, integrated by Imperial decree in the Kwantung army in 1936. Those weapons were mainly used in China and, according to some Japanese veterans, against Mongolians and Soviet soldiers in 1939 during the Nomonhan incident.  According to documents found in the Australian national archives in 2004 by Yoshimi and Yuki Tanaka, cyanide gas was tested on Australian and Dutch prisoners in November 1944 in the Kai islands.

Bombings

Massive aerial bombing by both Axis and Allied air forces took the lives of hundreds of thousands of civilians. Anglo-American bombing of German cities claimed up to 600,000 civilian lives,  most notably, the bombing of Dresden. The city of London was heavily bombed by the German Luftwaffe from September, 1940 to May, 1941 during their blitz of Britain; at one point the city was bombed for 57 straight nights. For the first, and so far only, time, nuclear weapons were used in combat: two atomic bombs released by the United States over Japan devastated Hiroshima and, three days later, Nagasaki. The number of total casualties in these bombings has been estimated at 200,000.

War trials

From 1945 to 1951, German and Japanese officials and personnel were prosecuted for war crimes. Charges included crimes against peace, crimes against humanity, waging wars of aggression, and other crimes. The most senior German officials were tried at the Nuremberg Trials, and many Japanese officials at the Tokyo War Crime Trial and other war crimes trials in the Asia-Pacific region. Many other minor officials were convicted in minor trials, including subsequent trials by the Nuremberg Tribunal, the Dachau Trials, and the Khabarovsk War Crime Trials. next