Two members may unite to create a that can subject the third member to group pressure in order to conform. it is an alliance created in an attempt to reach a shared objective or goal.

A Coalition

Explanation:

The word coalition is the denotation for a party that is created when two or more individuals, organizations, governments, political parties and military's decide to collectively work together in an alliance to accomplish a common objective.

The word coalition connotes a coming together for a mission to be accomplished.

Coalition

Explanation:

A coalition occurs when two or more different entities temporarily unite to achieve a common objective.

As described in the question a coalition can be formed by two different members to achieve a group advantage, which can be a useful tool to convince other individuals to adopt an idea.

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