This kind of abuse is pretty quintessentially capitalistic. It is exploiting the weak for no reason but to make money - no ideology underpins it but the bottom line. You might find a similar story in China now that it is economically capitalist, but the horror of North Korea is of an entirely different character.
I don't know, I hear more of these stories from the USA than from the other two. Granted NK probably has a stricter policy on journalists. But this seems very common for the US.
Undocumented migrants are treated just about the same at the five mega-processing plants. Amputations without access to workers’ comp. are common.