caste system in nail salons

Rampant exploitation in almost all the nail salons in NYC as in the headline of today's NY Times. This article has 4 language versions including Chinese. Manicurists in these sweatshops have caste system with Koreans on the top tier, Chinese on the 2nd rung and all others on the bottom tier. Korean owners drive Mercedes and live in multi-million mansions while their employees earn $3 an hour (or earn nothing in the first few weeks and are required to pay owners $100-$200 for training).    http://www.nytimes.com/2015/05/10/nyregion/at-nail-salons-in-nyc-manicurists-are-underpaid-and-unprotected.html