Sa Law from left21 wrote a piece on Nelson Mandela and his lesson for Hong Kong [1], a city where migrant workers are living in apartheid.
Due to their long working hours for six days a week, they lack the chance to socialize and mingle with the rest of Hong Kong society as others; they also generally lack ability to speak, read and write Chinese. Thus, they end up spatially and linguistically separated from the majority of Hong Kong people; and despite forming a large community of 320,000 workers, they are never considered part of the greater Hong Kong community, and their demands for equality or better rights are often greeted with deep outrage, as if they do not know their place.