Nguyen Bac Truyen is assaulted on his way to press for the release of fellow activists.
He will face trial next week according to an indictment sent to his family members.
Hundreds of supporters stage rare protest outside the appeals court.
Duong Van Minh says he has been persecuted for advocating reformed burial practices among the Hmong.
His wife calls for pressure on the government to release him to his family.
North Korea, China, Vietnam, and Laos languish at the bottom of a global media freedom index.
The group is detained while on their way to investigate dissident Nguyen Bac Truyen's arrest two days earlier.
The farmers had attempted to reclaim land confiscated for development.
The raid comes about a week before his wedding.
Le Quoc Quan said he has been denied legal and religious texts ahead of his appeal trial.
Activists say they're doubtful of assurances made at the country's Universal Periodic Review.
Diplomats in Geneva call on Vietnam to respect freedom of expression.
He calls on Hanoi to come clean to the UN on rights abuses.
Hanoi says his attendance would be 'harmful to the human rights image of Vietnam.'