6. Shirr Ishii 1892-1959
Ishii was the microbiologist and lieutenant general in a biological warfare unit known as Unit 731. This was a part of the Imperial Japanese Army during the second Sino-Japanese war.
He studied medicine at Kyoto University and began his experiments in biological warfare as a secret project for the Japanese military. This gave him the chance to perform some unmentionable and evil deeds on humanity.
Some of the atrocities committed by him and those under his command include vivisection of living people, some of whom were pregnant women who had been impregnated by the doctors, freezing body parts of prisoners and attaching limbs to other parts of the body after amputating them.