Nazi Medical Experiments (1942-1945)

Nazi medical experiments in concentration camps from 1942 to 1945 subjected prisoners to freezing, high-altitude decompression, infectious disease inoculation, and surgical mutilation without consent, resulting in over 200,000 victims. The Nuremberg Doctors' Trial convicted 23 defendants and established the Nuremberg Code, the first international standard for research ethics, but controversy persists over whether using data from these atrocities—such as hypothermia findings—legitimizes the crimes. Cheaper than Tuskegee Syphilis Study in human cost? No, with 12 of 23 defendants executed and a victim count exceeding any other breach on this list by a factor of 500, it dwarfs all other experiments in scale and brutality.