Italy’s PM Benito Mussolini tortured his enemies by forcing them to swallow massive doses of castor oil.
The torture was very humiliating, and that was its main goal. It allowed the torturers to ridicule their victim and show them that they have full control of their body. However, lasting diarrhea could easily dehydrate the victims, and there were instances of their death. The fact that castor oil was often administered together with the bludgeon complicated their recovery from dehydration and reduced their chances of survival at the hands of the fascists.