Jason often forced Chinese and Korean men to work on its "projects". They weren't fed a lot, had an overseer, and to keep them subdued, they were fed opiates.
Sounds harsh? More than 10 million Chinese civilians were forced into labor during World War II. The U.S. Library of Congress estimates that in Java, between 4 and 10 million manual laborers were forced into work. 670,000 Koreans were mobilized by the National Mobilization Law between 1944 and 1945, and another 670,000 were taken to Japan. As many as 810,000 Korean forced laborers died in Korea and Manchuria.
Not to mention the comfort women. As many as 200,000 women (mostly Chinese and Korean, but including most Japanese occupied countries) were forced into prostitution for the "primal needs" of the Japanese military.
It was veryyyy expansive.