Born in the southeastern province of Prey Veng, Chhim Sithar has worked at NagaWorld since 2007 as a supervisor and became an active union member in 2009.
Theary Seng is facing charges of conspiracy to commit treason and incitement to commit a felony, which together carries a maximum jail sentence of 12 years.
Thousands of workers have been on strike since last month in front of Nagacorp Ltd's hotel and casino complex in Phnom Penh, demanding the reinstatement of 365 employees who were let go in April.
Thailand has sent four UN-registered refugees back to Cambodia in the past month, driving dozens of others into hiding.
In Tuesday's court session in Cambodia, the judge announced that a verdict would be delivered on Feb. 8, if the hearings proceed according to plan, lawyer Sokong added.
The new governor's call for media to check in with authorities falls flat as information minister, local journalists warn it contravenes rights.
A spokesman for Cambodia’s National Police, Gen. Chhay Kim Khoeun, told The Associated Press all three nationals were now in pre-trial detention, after being expelled by the Thai authorities.
The 14 are charged with conspiracy to commit treason and incitement to commit a felony, and all have been in pre-trial detention for more than a year.
Another 60 political prisoners remain in custody, the rights group said.
Rong Chhun told cheering supporters outside the prison that he would continue his activities and urged all Cambodians to fight for freedom and human rights.
Media advocates in Cambodia say the government should use the country's press law rather than the threat of criminal charges to respond to errors in reporting.
A court in the capital Phnom Penh sentenced the 10 activists, who had been demonstrating in support of border activist and trade unionist Rong Chhun, to 20 months in prison, a defense lawyer and a rights group said.
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