Walter Jackson Freeman II was an American doctor and member of the American Psychiatric Association. Although he is the only one on our list who hasn’t performed a direct criminal practice on his patients, he can be blamed for harming as many as 3,400 people by using a very controversial and primitive medical technique: the lobotomy.
His operations were performed by inserting a metal pick into the corner of each eye socket, moving it back and forth, and thereby severing the connections to the pre-frontal cortex in the frontal lobes of the brain.
This method did not require a neurosurgeon and could be performed outside of an operating room without the use of anesthesia. Freeman actually used his personal van as a surgery room, which he called the “lobotomobile”.
Dr. Freeman was finally banned from performing surgery after the death of some of his patients from brain hemorrhage.