The Mexican Supreme Court released 20 evangelical Indians from prison this past week.
Judges said prosecutors had used illegally-obtained evidence in their conviction. The men were accused in the massacre of 45 Indian villagers in the state of Chiapas, some 12 years ago.
More than 30 additional prisoners may be released in the coming weeks.
The prisoners maintained their innocence, but said they don't hold resentment against those who accused them.