The trial of the 23 activists have been heavily criticized by rights groups, who say they are being tried to discourage further demonstrations.
Workers from the Chevron brand have been striking since May 12, calling for an increase in the minimum wage, to $160 per month.
Observers say the gains made by the opposition will change the look of politics at the local council level.
The team will be in Cambodia this week, meeting with the National Election Committee and other election officials.
Among them was a Burmese woman who spent seven years in prison, as well as Cambodian land activist Tep Vanny, an outspoken community leader who has also been jailed.
The Coalition for Integrity and Social Accountability says this is the best way to reduce the rampant corruption in Cambodia.
Rights groups and development advocates say the draft laws have not been reviewed well enough and fall short of international standards.
Anti-Chinese demonstrations over the South China Sea turned deadly in Vietnam this week, pushing as many as 1,000 Chinese into Cambodia.
Negotiations with Chevron and Caltex stalled Tuesday, after the company failed to give a definitive time frame to salary increases.
In Vietnam, there has been a surge of anti-Chinese protests, following China’s establishment of an oilrig in a section of the South China Sea that Vietnam claims.
Vann Sophath says he was threatened by security guards of the Khun Sea company, which belongs to in-laws of the prime minister.
Up to 300 workers from 18 different stations continue to call for a raise in the minimum wage, to $160 per month.
Vietnamese mobs have set fire to Chinese and Taiwanese factories in the south of Vietnam.
No clashes were reported Tuesday, but after the marchers were dispersed, hundreds of police were seen surrounding Wat Phnom.
The elections seat leaders at the provincial, district and city level, but they are only voted on by members of commune councils—elected representatives at the local level.
Some 300 Caltex workers at 18 stations in Phnom Penh have joined garment workers in calling for a raise in the minimum wage to $160 per month.
The villagers say a Vietnamese rubber company began developing in the area in 2008, ultimately evicting some 400 families from their homes across more than 2,000 hectares of land.
The opposition continues to push for political reforms, following July 2013 elections it says were marred by fraud.
Employees say they make between $110 and $130 a month at Caltex, a brand under the US-based Chevron Corporation, whose net income in 2013 was $120 billion.
Outside the court Friday, supporters for the 21 detainees gathered, condemning the court’s decision.
ព័ត៌មានផ្សេងទៀត