🧠Dr. Josef Mengele ("The Angel of Death")
Who: Nazi physician at Auschwitz.
Why infamous: Conducted inhumane experiments on prisoners, especially twins. No anesthesia. No consent. Horrific outcomes.
Fate: Escaped to South America. Never captured. Died in Brazil in 1979.
Legacy: Synonymous with medical evil. Sparked major reforms in medical ethics (like the Nuremberg Code).