Tourism had traditionally been a vital source of the island's revenue and economic activities. But in the 1980s, garment manufacturing became one of the main economic driving forces in Saipan when the U.S. government agreed that the CNMI would be exempted from certain federal minimum wage and immigration laws. While one result of these changes was an increase in hotels and tourism, the main consequence was that dozens of garment factories opened and clothing manufacturing became the island's chief economic force, employing thousands of foreign contract laborers (mostly young Chinese women) at low wages.  The manufacturers could legally label these low cost garments "Made in the U.S.A." and the clothing shipped to the U.S. market was also exempt from U.S. tariffs. By 1998, the Saipan garment industry exported close to $1 billion worth of apparel products to the mainland. The working conditions and treatment experienced by employees in these factories were the subject of controversy and criticism.