Resist Groupthink

The stronger the culture, the greater the risk of groupthink. Groupthink is when members strive for unanimity, and do not challenge organization thinking. There is too much reliance on one powerful figure, and the group is the base of their identity. It happens all the time that to avoid conflict in the group, one does not speak up to realistically appraise alternative solutions. Cliques are normal, reminiscent to lunch or meetings not asked to participate. The work environment turns stressful due to tension-filled dialogues if you disagree.
Group cohesiveness can also be shown when everyone agrees to disagree against management. If a threat fro management is felt, a group can stick together to prevent layoffs. This situation backfires on the true intent of teaming, since the group only has one agenda, with the rest left in the back burner. There is collective rationalization that nothing can escape the sanctity and safe haven the group provides.
One way to unblock group cohesiveness is to have anonymous brainstorming. Each idea is written on a piece of paper, without attribution to any names.