Final answer:
The Nuremberg Trials were held by the Allied forces to prosecute Nazi leaders for their roles in the Holocaust, resulting in various sentences including death and imprisonment.
Step-by-step explanation:
The trials held by the Allied forces in 1945-1946, which prosecuted 23 Nazi leaders responsible for the Holocaust, were called the Nuremberg Trials. The International Military Tribunal was responsible for these trials, where Nazi leaders were charged with crimes against peace, war crimes, crimes against humanity, and conspiracy to commit these crimes. The trials concluded with 12 defendants being sentenced to death, 3 imprisoned for life, 4 receiving 10-20 years in prison, and 3 acquitted.