Outside the National Assembly on Tuesday, opponents of the law marched with loudspeakers and banners that said, “Stop” and “Say No.”
An estimated 430,000 youth under the age of 18 work in Cambodia.
Congressional lawmakers asked how the US could help improve rights and democracy in Burma, Cambodia, Hong Kong and Thailand.
In 2009, a man approached Thin Seangly with promises of good work and good pay on a Thai fishing boat - and that was when his troubles began.
Rights workers fear that Cambodia is turning them away, or arresting them and turning them back over to Vietnam, rather than obliging international norms and laws.
The youths hope to become volunteers to disseminate information through their communities, to prevent labor trafficking and other forms of exploitation.
Labor leaders say they are concerned that a number of unions would be shuttered if a new law to govern them is passed.
National Assembly spokesman Chheang Vun told VOA Khmer the draft has arrived at the Assembly, but it will take some time for committees to review it.
An increasing number of Cambodians are seeking work abroad, leading to reports of abuse.
The families received notice on June 5, ordering them to leave their homes within one month.
A study by the International Justice Mission shows a decline in the prevalence of girls under the age of 17 in brothels and other venues.
Thin Seangly is one of tens of thousands of Cambodians who leave the country every year forced by poverty to seek wages in the richer nations of Thailand and Malaysia.