Cambodian Genocide

After Pol Pot and his socialist group the Khmer Rouge took over the Cambodian people, mass murder was evident.  There were "fields" used for executions, which were later called Killing Fields.  Pol Pot thought he was bringing the people a solution; he being the savior, but it turned into a mass genocide leading to more than an estimated two million people dead.

Secondary Source
A young man's experiences revisiting the old death camps and towns the Cambodian people were tortured in.

"Both were used as part of the interrogators' range of techniques to extract confessions, either by hanging the prisoner by his arms or repeatedly ducking the victim into a jar full of water head first."