Unit 731. Unit 1644. Unit 100. These were the main killing units of the Imperial Japanese military's experiments in biological and chemical warfare. From 1935 to 1945 Unit 731 and it's "siblings" murdered an estimated 250,000 human beings in some of the most barbaric tortures ever devised. All in the name of "science". All for the purpose of helping Japan create horrific biological and chemical weapons of mass destruction. All to glorify their false emperor-God.
Unit 731 was officially (and euphemistically) known as "The Epidemic Prevention and Water Purification Department of the Kwantung Army". (The Kwantung Army was the Japanese Army that occupied northern China.). With full knowledge of, and approval by Emperor Hirohito, the Japanese Kempetai (military police) constantly supplied Unit 731 with a steady stream of political prisoners for the "scientists" to experiment with. Later in the war, the Japanese used more than just political prisoners. Tens of thousands of Chinese and Korean citizens were sent to these death chambers. And also there were Allied POWs. American, British, Dutch, and Australian soldiers and sailors went to their deaths in gruesome, merciless experiments.
And just what did the Japanese do? Vivisection. While the victims were alive and awake. And with no anesthesia. The Japanese did this to men, women, children, and infants.
Just think about that for a minute.
The Japanese also injected people with syphilus, gonorrhea, and the bubonic plague. They would amputate and reattach the limbs to other sides of their body. They did experiments with frostbite by dipping parts of the body in freezing water and letting the limbs freeze solid overnight. Then they would beat the limb with a metal bar until it fell off.
And so on.
So what happened to these monsters once the United States defeated Japan? Nothing. We captured most of the leaders and "scientists"/torturers. . . and then we granted ALL of them immunity. Yep, we did that. Why on earth??? The US wanted to know what the Japanese had learned and developed in the bio/chem weapons so that we could develope our own biological and chemical weapons stockpile.
Amazingly, while we never prosecuted any of the monsters, the Soviet Union did. They put 12 ringleaders on trial and gave them all sentences of 2 to 25 years. Of course, the Soviets extracted plenty of info from their own Japanese prisoners and built their own bio/chem weapons.
Truth is often stranger. . . and more horrifying. . . than fiction.