Those executed included Hideki Tojo, General Masaharu Homma, Tomoyuki Yamashita, and five others who were blamed for atrocities during the war. The Japanese argued that they were subject to war crimes trials simply because of the heinous crimes of their German allies, essentially claiming the Allies were finding them guilty by association.
The actions of Unit 731 in China were ever examined at the War Crimes Trials in Tokyo. Using biological, chemical and thermal tests on Chinese and Allied prisoners, they dropped bubonic plague on Chinese cities, froze naked Soviet prisoners in refrigerators, and experimented with anthrax, mustard and phosgene gas on POWs. Very little about unit 731 was known until the 1970's. The Tribunal does investigate the forced sexual slavery of hundreds of thousands of Korean, Chinese, Dutch and Filipino women. No compensation, or even a statement of admission, was given. That topic is a source of fierce debate in Asia today.
What was never recounted in either the European or Asian war crimes trials were the Allies' war crimes. Systematic atrocities on the scale of Manila or Nanjing were never committed, but there had never been an apology or understanding of the horrors of firebombing of civilians and the use of atomic weapons.
Most of the 20,000 men were released when the Americans ended their occupation in 1952. Many right-wing Japanese deny there were war crimes at all. The 1997 release of Iris Chiang's The Rape of Nanjing resulted in a reexamination of World War II in Japan, with many people begininng to understand and examine Japan's actions.