Meach Sovannara, a former Radio Free Asia reporter, is facing a hefty sentence on charges of insurrection, for allegedly orchestrating violence in a July 15 protest.
At least three monks have been arrested and charged with disturbing public order.
Ten activists, three monks and two opposition members are currently in detention on various charges.
Lawyers for seven imprisoned activists on Thursday appealed for their release, following a swift trial and sentencing earlier this week that has been widely criticized.
The three activists Wednesday, including a former monk, were charged with disturbing public order, the same charge brought against the seven activists the day before.
The activists were sentenced to a year in prison and fined $500 each.
A former Japanese reporter is doing her part in the fight against human trafficking in Cambodia by publishing comic books and distributing them for free in and around Cambodia.
A Newsweek story published in May cast doubt on her origin story, and she later resigned from the Somaly Mam Foundation.
Hundreds of activists demonstrated in Phnom Penh on Thursday, gathering to protest the government’s failure to fulfill the promises of the Paris Peace Accords.
Forestry activists say at least 55,000 tons of luxury wood has been sent from Cambodia to China this year alone.
Some 300 people, including monks and students, marched through the capital on Friday, protesting a refugee deal between Cambodia and Australia.
Many of the protesters were victims of land disputes who said Cambodia is not ready to take on refugees because it has yet to solve many of its own lingering development questions.