Albert Stevens received the highest dose of radiation of anyone in the Manhattan Project. Stevens was not informed of what was done to him and did not give his consent.
Despite receiving 446 times the average lifetime exposure to plutonium, Stevens survived another 21 years, dying of heart disease at the age of 79. Dr. Joseph Hamilton, who conducted the experiment on Stevens, died of leukemia, apparently caused by radiation exposure during his life. It is hard to believe that such a story could have happened today, but you never know.