It's Japan's horrifying human experiments to study and develop biological weapon during the WW-II. And before japan surrendered, they destroyed all the evidences of Unit 731.
Yes, among many, search human experiments by each country the amount is shocking. The Age Of Enlightenment brought a concern with population growth. Even Ethopian women of late have been sterilised without their knowledge. The reason we fear alien abduction films where people are experimented on is not because of our fear of aliens, but because we are capable of such cold and gross atrocities. Who decides who in the population should be experimented on or sterilised?
http://listverse.com/2008/03/14/top-10-evil-human-experiments/
https://en.m.wikipedia.org/wiki/HIV_trial_in_Libya
http://m.mic.com/articles/53723/8-shocking-facts-about-sterilization-in-u-s-history
http://www.forbes.com/sites/eliseknutsen/2013/01/28/israel-foribly-injected-african-immigrant-women-with-birth-control/