Investigators found the contractors paid employees less than what was required by law, according to a US Department of Labor statement released Monday.
The settlement by the companies will affect more than 2,400 employees.
US officials say workers entered on tourist visas and without proper visa authorisation. They were also forced to incur debt of thousands of dollars for airfare and recruitment fees prior to their employment in Saipan, according to the settlement.
"Employers who evade the law in an attempt to reduce expenses must not gain a competitive advantage over those who play by the rules.
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Regardless of where work is performed in the U.S. or its territories, we will continue to enforce the law and level the playing field."
The Chinese laborers worked 13 hours a day without weekends or holidays, and had their passports confiscated upon arrival in Saipan, said Li Qiang, the executive director of New York-based China Labor Watch, an advocacy group.
"More Chinese companies are expanding abroad, and in regions like the U.S. and Europe, hiring labor there can be expensive," Li said.
"Firms will prefer bringing Chinese workers." But oftentimes, the workers are lured with false promises such as high wages and even help in obtaining a green card -- none of which materializes once they arrive. Higher fines and penalties levied by US authorities will help combat these practices, Li said.
Hong Kong-based Imperial Pacific International contracted with the four Chinese firms for construction on Saipan. The company said it would release a statement regarding the settlement Tuesday in Hong Kong.