Timerover51
SOC-14 5K
That's in Section III, Art. 27-34:
(Note that this is the 1929 GC; it was revised in 1949.)
"SECTION III
WORK OF PRISONERS OF WAR
CHAPTER 1
General
Art. 27. Belligerents may employ as workmen prisoners of war who are physically fit, other than officers and persons of equivalent statue, according to their rink and their ability.
Nevertheless, if officers or persons of equivalent status ask for suitable work, this shall be found for them as far as possible.
Non-commissioned officers who are prisoners of war may be compelled to undertake only supervisory work, unless they expressly request remunerative occupation.
During the whole period of captivity, belligerents are required to admit prisoners of war who are victims of accidents at work to the benefit of provisions applicable to workmen of the same category under the legislation of the detaining Power. As regards prisoners of war to whom these legal provisions could not be applied by reason of the legislation of that Power, the latter undertakes to recommend to its legislative body all proper measures for the equitable compensation of the victims.
CHAPTER 2
Organization of work
Art. 28. The detaining Power shall assume entire responsibility for the maintenance, care, treatment and the payment of the wages of prisoners of war working for private individuals.
Art. 29. No prisoner of war may be employed on work for which he is physically unsuited.
Art. 30. The duration of the daily work of prisoners of war, including the time of the journey to and from work, shall not be excessive and shall in no case exceed that permitted for civil workers of the locality employed on the same work. Each prisoner shall be allowed a rest of twenty-four consecutive hours each week, preferably on Sunday.
CHAPTER 3
Prohibited work
Art. 31. Work done by prisoners of war shall have no direct connection with the operations of the war. In particular, it is forbidden to employ prisoners in the manufacture or transport of arms or munitions of any kind, or on the transport of material destined for combatant units.
In the event of violation of the provisions of the preceding paragraph, prisoners are at liberty, after performing or commencing to perform the order, to have their complaints presented through the intermediary of the prisoners' representatives whose functions are described in Articles 43 an 44, or, in the absence of a prisoners' representative, through the intermediary of the representatives of the protecting Power.
Art. 32. It is forbidden to employ prisoners of war on unhealthy or dangerous work. Conditions of work shall not be rendered more arduous by disciplinary measures."
The Japanese, having never signed the Geneva Convention, pretty much tossed all of this out the window when it came to European prisoners of war. Non-Europeans generally were simply shot out of hand, although Indian prisoners were "highly encouraged" to join the Indian National Army and fight for Japan. If you want some somewhat sickening reading, read up on the Japanese treatment of prisoners and also of the Chinese in occupied China. Note, the individuals involved in this from Japan were average Japanese soldiers, not SS concentration camp guards.