North Koreans being used as cheap labour?

              A significant source of funding for North Korea seems to come from countries like Mongolia, who take on groups of North Korean workers to work in sewing factories, road construction, building construction, etc.  It would seem that this is a small step forward for North Korea, until it is examined more closely.  Reportedly the workers get drastically underpaid even though the employers agree that they are hard working, and highly skilled workers.  The workers are forced to stay on the grounds of where they are working and must ask permission from their embassy to even talk to "outsiders", meaning locals or anyone else that isn't directly involved in their work.  The workers aren't even directly paid by their employers, but rather by their embassy, which claims all of the money from their work and then pays them as they deem fit.
 There are always supervisors that are carefully watching the workers to make sure that they have no contact with the outside world and remain focused on their given tasks.
                 When it comes to other countries being responsible for allowing this to happen, they claim that their hands are clean.  The North Korean embassies are paid the same amount per worker as any other workers are, and it is up to them to pay their own employees.  This allows the North Korean officials to gather large amounts of money without having to do anything more than sending over some of their citizens to countries such as Mongolia.  The part where this becomes even more shady is when suspicions start to arise that the workers are actually being threatened to work by the North Korean government, using their families as leverage.  This violates many human rights laws, and it isn't even being concealed.  On the contrary, Mongolia is actually changing its laws so that more North Koreans can come over and work for pennies while their government reaps all of the profits.
                    There are also high numbers of North Korean workers in Russia and China, although the exact numbers in China aren't known because the information isn't made public.  It is amazing that a country as closed off and unconnected as North Korea has managed to stay integrated in the international market, even if the majority of people in the world are unaware of it.