Crimes committed by Imperial Japan were responsible for the deaths of millions , some estimate between 3 million and 14 million civilians and prisoners of war through massacre , human experimentation , starvation , and forced labor that was either directly perpetrated or condoned by the Japanese military and government with a significant portion of them occurring during Tojo 's rule of the military . One source attributes 5 million civilian deaths to Tojo 's rule of the military
human experimentation
Unit 731
Hideki Tojo