This is an image of the Nuremberg Courtroom. This courtroom is still in operation today but was used after WWII for the first trial with senior Nazi supporters including Goering, Hess, Borman, and Speer among other well-known Nazis.
This courtroom was chosen firstly, because it was not entirely destroyed during the war unlike much of Germany, secondly because Nuremberg is a place that is seen as the birthplace of Nazi law (location of Nazi Rallis and also namesake for the Nuremberg Laws that began the disassociation of Jews in German society), so Robert Jackson felt that it was an appropriate place for the demise of the leaders.
The Nuremberg Trials set a significant precedent for international criminal law and for cooperation amongst multiple states. It was an effort to bring justice to the world for the atrocities committed during WWII and held a multitude of trials for war crimes of the Axis Powers.
Check out these links for scholarly sources discussing the Nuremberg Trials, the Kellogg-Briand Pact, and the laws that developed in international law after WWII. These sources contain discussions about how the laws before WWII set the stage for the UN Charter and modern international law that still applies today.
Again, consider when deciding your research topic, how treaties and policies throughout history relate to each other. For example, how did the Nuremberg Trials relate to the creation of the UN Charter.
This is the trial information specifically regarding Hermann Goering, one of the most notorious Nazis. Goering is also considered (perhaps self-appointed) to be the ring-leader and the most influential of the defendants at the first trial.
Positivism is a topic of Jurisprudence, but was particularly prevalent in Nazi Germany.