Leak radiation on civilians as an experiment: https://en.wikipedia.org/wiki/Downwinders#Hanford

Mind-control via 1000 mics of LSD: http://en.wikipedia.org/wiki/Mkultra#LSD

Research on human test subjects: http://en.wikipedia.org/wiki/Tuskegee_syphilis_experiment

Pearl Harbor a set-up: http://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma#Polish_breakthrough