What should you do when........One team member has bullied the rest of the team into accepting his viewpoint on a decision. Now the rest of the member

Don’t allow the team to gang up on any individual—even one who bullies.
A team must compromise and accept the decision the team makes. In this situation you do not want to interfere; however, you might want to speak up and encourage the team as a group to find some common ground or new possibilities.