Area residents unhappy that they were not consulted.
UN member states recognize progress but continue to express concerns.
Forced to work overtime for no extra pay, some are also tied and beaten and accused of stealing supplies.
Five incidents of human trafficking to China have already occurred this year.
Lao company is pushed out as province sends the projects to a company previously granted a 99-year concession to develop an SEZ in the area.
Some have been compensated in amounts too low for their needs, while others have not been paid at all, local sources say.
The move will further hurt downstream communities already hit by a severe drought called the worst in 60 years by the Mekong River Commission.
The trade continues elsewhere in the country, though, with sales reported in Chinese shops in the capital, Vientiane.