If villagers living in the midst of poverty and war can be nudged to work better together with just three simple rules (honed via a parental competition study) and a reward (money, in this case) then maybe your group (team, board, committee, etc.) could too:
1. The village leaders (or your project leader) are elected by secret ballot.
2. The village (or your group) holds communal meetings – meaning open to all participants and no secret side confabs.
3. The results of all meetings are covered completely and accurately and that coverage is made available, quickly, to all participants. Here are two other posts you may find helpful: