After the atrocities of the Holocaust and World War II it was realized that more defined standards were needed and they came up with the Fourth Geneva Convention. It stipulates how to deal with civilian populations in wartime, enmity, et cetera. And the keeper of the Convention is Switzerland.
http://www.adl.org/Anti_semitism/speech.asp
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The rights of POWs are set out in the third Geneva Convention, but it is Article 13 of the document that has come under scrutiny in recent days. That article says: "Prisoners of war must at all times be protected, particularly against acts of violence or intimidation and against insults and public curiosity."
The keeper of the convention is the International Committee of the Red Cross.
http://www.smh.com.au/articles/2003/03/24/1048354544299.html