North Korea is doing exactly that as we speak.
In the gulags that effort was at least spent on public works projects, here it's to make rich people slightly richer with next to free labor.
How’s the death rate in the US prison system, then?
If you look at Table 8, the death rate for 45-54 year olds in state prisons in 2014 was 342 per 100,000. For the 45-54 age group as a whole, the mortality rate was about 400 per 100,000. Note that the figure for prisons is mostly men, while the figures for the whole population is both men and women.
Accounting for the gender difference, the prison population has a lower death rate than the general population at the same age group. The difference is especially noticeable among younger prisoners. In the 25-35 demographic, the death rate in prison is 1/4 the general population. This is not surprising. Prisoners eat a controlled diet, they don’t drive, they have limited exposure to occupational hazards, etc.
All causes mortality rate in US prisons is higher than Germany or France, but comparable to Sweden and Switzerland at around 27.5 per 10,000 (note difference in denominator). http://www.statewatch.org/news/2017/apr/coe-annual-prison-st... (table 13)
Obviously many people fleeing Germany and the occupied countries during that period, knew something bad was happening, but overall, it’s my understanding that before and during the war, the rest of the world really wasn’t aware, or at least not aware about how bad it was.
It was the invasion of other countries that was cause to fight Germany. It was much less of a humanitarian act, though after the war it’s easy to paint it as one.
https://en.wikipedia.org/wiki/The_Mass_Extermination_of_Jews...
https://timesmachine.nytimes.com/timesmachine/1942/02/13/852...
The catch, of course, is that governments don’t act with a single voice: during war time intelligence agencies would be loathe to confirm anything if it revealed information about their sources, and there were enough anti-semites and Nazi sympathizers that all but the most conclusive evidence might be downplayed or lead to consequences (reportedly, concern losing support in Hungary was a factor in not leading with what was happening to the Jews).
https://archive.org/details/TheMassExterminationOfJewsInGerm...
I had no idea that the "United Nations" was a thing during WWII (though it appears to be more of a synonym for the allies than the body we're familiar with today).