The IMT only held one trial before disagreements between the four wartime allies stopped the series of trials that were planned. The four countries occupying Germany carried on with trials of many people in their own zone of occupation. Twelve that were held by the United States are the most famous of these rials. They involved the some of the most important people to be prosecuted after the 24 Major War Criminals.
20 of the 23 on trial were medical doctors. They were accused of war crimes because they did medical experiments on prisoners of war and civilians of occupied countries, and helped in the mass murder of concentration camp inmates. They were also accused of doing the same to Germans. This was called a crime against humanity.
Freidrick Flick and 5 other directors of Flick Kommanditgesellschaft. The Flick KG used slave labour in its mines and factories, as well as taking over factories in France, Poland and Russia, and "Aryanisation of property" which means getting things once owned by Jews who were forced to sell cheaply.
24 leaders of the IG Farben company charged with war crimes and crimes against humanity because of the slave labour they used, as well as stealing or plundering from occupied countries, like the Flick and Krupp companies
14 leaders of the Reich Commissioner for the Strengthening of Germanism, the Repatriation Office for Ethnic Germans (Volksdeutsche Mittelstelle, VoMi), and the Lebensborn society, charged with racial cleansing and resettlement activities which included forced abortions
Directors of this company were charged with being involved in the plundering, devastation, and exploitation of occupied countries, as well as taking part in the murder, extermination, enslavement, deportation, imprisonment, torture, and use for slave labor of civilians who came under German control, German nationals, and prisoners of war;
14 senior officers of the German Armed Forces . They were charged with War crimes by being responsible for murder, ill-treatment and other crimes against prisoners of war and enemy belligerents, and also crimes against humanity by taking part in or ordering the murder, torture, deportation, hostage-taking, etc. of civilians in occupied countries.