"[1] As the Second World War was nearing its end, on 26 July 1945, Allied leaders Winston Churchill, Harry S Truman, and Chiang Kai-shek issued the Potsdam Declaration, which demanded Japan's unconditional surrender.
In addition, the document stated: "The occupying forces of the Allies shall be withdrawn from Japan as soon as these objectives have been accomplished and there has been established in accordance with the freely expressed will of the Japanese people a peacefully inclined and responsible government" (Section 12).
It appears to have been the brainchild of Kosaku Teramoto, a former member of the Thought Police, who was now the head of the Labor Standards section of the Welfare Ministry.
The situation during the occupation was very confusing, and Teramoto managed to convince a number of industrialists, bureaucrats, and politicians that GHQ was demanding strict controls on working conditions.
He and a small staff then drafted the bill, based on prewar provisions that had been suspended by the military government, as well as a review of International Labor Organization conventions.