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.
Qatar has been heavily criticized for rights abuses among laborers in the construction of stadiums and other facilities in preparation for the 2022 World Cup.
Following a two-day visit, US Deputy Assistance Secretary of State Scott Busby told reporters Cambodia should reconsider the law.
The two films were produced by USAID’s office to combat human trafficking and are being shown at the Bophana Center in the capital.
US Deputy Assistant Secretary of State Scott Busby is scheduled to meet senior government officials and civil society leaders to discuss several issues, including the contentious draft NGO law.
The embassy also suspected that local non-profit AFESIP which operates shelters in Cambodia for victims of sex trafficking, and which Somaly Mam co-founded in 1996 had "mismanaged" its funding.
Labor Ministry officials said Friday that a draft law, which could be wrapped up soon, will help support union organization.
Phnom Penh Municipal Court this week continued hearings of a group of six political activists accused of inciting violence in a demonstration in July 2014.
Diplomats, including the US ambassador, have called on the government to make the draft public and to have more discussion before it is finalized.