Short answers, pulled from the story.
The offences that would be prosecuted were crimes against peace, crimes against humanity, and war crimes. The final wording defined these acts as murder, extermination, enslavement, deportation, and other inhumane acts committed against any civilian population.
On the 8th of August, the Nuremberg Charter was signed in London. This document served as the legal instrument for the joint tribunal convened by France, the Soviet Union, the United Kingdom, and the United States.
Fourteen defendants were sentenced to death: Göring, Ribbentrop, Keitel, Kaltenbrunner, Rosenberg, Frank, Frick, Streicher, Sauckel, Jodl, Seyss-Inquart, and Bormann. On the 16th of October, ten were hanged, with Göring killing himself the day before.
Representatives of four nations negotiated the form that the trial would take at the London Conference held from the 26th of June to the 2nd of August 1945. These nations included France, the Soviet Union, the United Kingdom, and the United States.
Seven defendants were sent to Spandau Prison to serve their sentences while High Commissioner John J. McCloy overturned most of the sentences in 1951. The last three prisoners, all convicted at the Einsatzgruppen trial, were released in 1958.