This has led to increased reports of rights abuses in host countries, particularly Malaysia, where young Cambodian are sent to work as maids.
The two women were arrested in early September and accused of inciting violence and criminal activity among demonstrators.
The European Union on Friday called on Cambodia to immediately release jailed Beehive Radio owner Mam Sonando, while condemning political court actions and ongoing rightrs abuses.
Canadian journalist Olesia Plokhii was one of two journalists from the Cambodia Daily who went with environmentalist Chut Wutty to the remote jungle mountains of Koh Kong province in April.
Koh Kong provincial court has handed a commuted sentence of six months to the man alleged to have shot the military policeman who killed environmentalist Chut Wutty in April.
US Embassy spokesman Sean McIntosh told VOA Khmer in an interview Friday the US would continue to monitor the situation.
Mam Sonando has been in jail since his arrest in July and was handed a 20-year prison sentence earlier this month.
The gathering underscored the myriad fronts of unrest the government is currently facing, due to land grabs, forced evictions and other rights abuses.
Local analysts say such continued reactions from Hun Sen, who often blasts the UN from his pulpit, are bad for the image of the country.
That rehearing, at the Appeals Court, is slated for next month.
Some 400,000 people have been affected by land disputes since 2003, the rights group Licadho estimates.
Loun Sovath is a land rights activist who has help galvanize impoverished Cambodians whose land is threatened by economic land concessions or real estate developments.