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Luckily the UN was not organized enough to stop the Nuremberg Trials at the time.

The United Nations Charter is the constitution of the United Nations. It was signed at the United Nations Conference on International Organization in San Francisco on June 26, 1945 by 50 of the 51 original member countries (Poland, the other original member, was not represented at the Conference, signed it later). It entered into force on October 24, 1945, after being ratified by the five founding members—the Republic of China, France, the Soviet Union, the United Kingdom, and the United States—and a majority of the other signatories.

As a Charter it is a constituent treaty, and all members are bound by its articles. Furthermore, it explicitly says that the Charter trumps all other treaty obligations. It was ratified by the United States on August 8, 1945, making that nation the third, after Nicaragua and El Salvador, to join the new international organization.