Josef Rudolf Mengele (The Angel of Death) killed the highest number of people on the experiments he did on prisoners during World War II. In 1934 he was promoted to the rank Captain. He was then sent to the concentration camp at Auschwitz-Birkenau as the medical officer. He was abusing children prisoners. Those who are shorter than 150 cm were sent to gas chambers. The remaining were tortured. He was interested with identical twins and would try to change their eye color by injecting chemicals. He would also amputate children for experiments and kill them to dissect their bodies. After was, he fled to South America and was never captured for the crimes he did during the war.