Quite possibly the most darkest secret that Japan has as a nation. World War II is known to us for how gruesome it was and the major impact it had on the world. We know well of Nazi Germany and the horrid acts committed against the Jewish people as well as the Gypsies and other groups deemed less than, but not many people have spoken about Imperial Japan and the absolutely grotesque acts committed on not just Korea, China, and all of Asia as well as its effect on the Western World.  This is the horrific story of Unit 731.  Sources -    https://todayinhistory.blog/2018/09/02/september-2-1945-unit-731/ https://allthatsinteresting.com/unit-731 https://history.state.gov/milestones/1921-1936/mukden-incident#:~:text=On%20September%2018%2C%201931%2C%20an,to%20retaliate%20and%20invade%20Manchuria. https://ahf.nuclearmuseum.org/ahf/history/unit-731/ https://medium.com/leadership-counts/pardoning-devils-the-american-cover-up-of-imperial-japanese-unit-731-504f966cf08d#:~:text=Although%20responsible%20for%20some%20of,by%20the%20United%20States%20government.