Nuremberg Principles

The Nuremberg Principles arose from the Nuremberg War Trials after the Second World War. They sound about right. The Wikipedia's article makes no mention of the gross violations that were part of the proceedings although it does tells us that:-
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US Supreme Court Chief Justice Harlan Fiske Stone called the Nuremberg trials a fraud. "[Chief US prosecutor] Jackson is away conducting his high-grade lynching party in Nuremberg," he wrote. "I don't mind what he does to the Nazis, but I hate to see the pretence that he is running a court and proceeding according to common law. This is a little too sanctimonious a fraud to meet my old-fashioned ideas."

Associate Supreme Court Justice William O. Douglas charged that the Allies were guilty of "substituting power for principle" at Nuremberg. "I thought at the time and still think that the Nuremberg trials were unprincipled," he wrote. "Law was created ex post facto to suit the passion and clamour of the time."
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Stone was to the point and being a very senior judge he knew what he was talking about.

There was extensive torture of witnesses for example. One was Rudolf Höß, a commandant of Auschwitz

Nuremberg Principles
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Principle VI states,

"The crimes hereinafter set out are punishable as crimes under international law:

(a) Crimes against peace:

(i) Planning, preparation, initiation or waging of a war of aggression or a war in violation of international treaties, agreements or assurances;

(ii) Participation in a common plan or conspiracy for the accomplishment of any of the acts mentioned under (i).

(b) War crimes:

Violations of the laws or customs of war which include, but are not limited to, murder, ill-treatment or deportation of slave labor or for any other purpose of the civilian population of or in occupied territory; murder or ill-treatment of prisoners of war or persons on the Seas, killing of hostages, plunder of public or private property, wanton destruction of cities, towns, or villages, or devastation not justified by military necessity.

(c) Crimes against humanity:

Murder, extermination, enslavement, deportation and other inhumane acts done against any civilian population, or persecutions on political, racial, or religious grounds, when such acts are done or such persecutions are carried on in execution of or in connection with any crime against peace or any war crime."

[edit] Principle VII

Principle VII states, "Complicity in the commission of a crime against peace, a war crime, or a crime against humanity as set forth in Principle VI is a crime under international law."
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This good enough to indict Blair, Brown, Bush, Cameron, Adolf Hitler, Obama, it goes on.