Asian Massage parlors in USA are controlled by gangs

Here is an article about Asian Massage parlors in USA and how they are controlled by gangs
Most of from Hong Kong but some from China and Vietnam

Here is an exerpt:
The increase is a direct result of the expanding power of Asian gangs in the United States. The gangs supply the houses with new girls, provide them with clients and protect them from extortion by other gangs and busts by the police. Highly organized, these gangs often work for larger, more powerful and more established organizations known as tongs and for Chinese secret societies called triads, officials say.