 Unit 731 was well-known for its biological warfare which often included painful experiments on prisoners—human guinea pigs.
After the war was over, fighting did not stop. North and South Korea began a war over territory. The Vietnam war started up. The Chinese civil war raged on, until Mao and communism took over the country.
In Japan (specifically Tokyo), from 1946 to 1948, war crime trials were held, where the Allies would try the Japanese government officials and commanders for breaking rules of war. However, the Japanese Emperor was not considered a war criminal because of Japan's intense loyalty to him. While most of the "war criminals" were given prison sentences, about 900 were executed. One of the atrocious acts brought to the attention of the world was Unit 731. Here, biological warfare was being tested by the Japanese. This included breeding anthrax and dropping it onto Chinese towns to eliminate the citizens and testing various gases on prisoners. Today, some Japanese refuse to admit that these war crimes ever happened.
 The war trials in Tokyo made sure Japanese war criminals were punished for their crimes.
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