Fifty years ago, 23 Nazi physicians were defendants before a military tribunal in Nuremberg, charged with crimes against humanity. During that trial, the world learned of their personal roles in human experimentation with political and military prisoners, mass eugenic sterilizations, state-ordered euthanasia of the “unfit,” and the program of genocide we now know as the Holocaust. These physicians, and their colleagues who did not stand trial, were universally condemned in the free world as ethical pariahs. The term “Nazi doctor” became the paradigm for total defection from the most rudimentary elements of medical morality. The caduceus literally became the instrument of the swastika.