Authorities block them from leaving the country ahead of Vietnam's Universal Periodic Review in Geneva, a rights group says.
The organization has faced harassment since announcing a new executive committee.
Thousands of workers building the plant clash after an argument with security guards.
He says he paid bribes to senior Communist Party officials.
They ask for support from the government but vow to plow ahead if they don't get it.
He is detained at the airport and interrogated for 13 hours before being confined to his home.