USA Apologises for Forced STD experiment
http://www.msnbc.msn.com/id/39456324/ns/health-sexual_health
Hey, sorry for kidnapping you and doing some experiments on you, we'll be leaving now...
tl;dr
"U.S. government medical researchers intentionally infected hundreds of people in Guatemala, including institutionalized mental patients, with gonorrhea and syphilis without their knowledge or permission more than 60 years ago. "
EDIT:
Some new info:
"The Guatemala experiments, which were conducted between 1946 and 1948, never provided any useful information and the records were hidden."
So yeah, these people all got some serious STI's without consent or knowledge for... well nothing.