A member from Taiwan’s Control Yuan – the official investigatory agency that monitors the four other branches of the government – has initiated an investigation into whether government bodies have been conducting measures to prevent legal Vietnamese migrant workers from becoming illegal runaways.

Upon his departure as the top Vietnamese representative to Taiwan, Tran Duy Hai said both countries have made solid progress in exchanges and economic cooperation, the Taiwan Times reported.

Vietnamese nationals made up the majority of more than 50,000 runaway migrants in the country, he said, adding that the most likely reason behind the trend was the high fees charged by employment agencies.

A member of the Control Yuan, Peter Chang Wu-shou, said the exorbitant fees had been a problem for years. Greater effort and collaboration was required from Taiwanese authorities to combat illegal migrant labor issues and related problems.

Chang argued that the country’s laws governing migrant labor had to be investigated to see whether they provided sufficient protection for the vulnerable labor force. The Ministry of Labor had to be reviewed to ensure it had effectively monitored employment agencies for malpractice.