Why do people join and lead groups?

In an outside work environment, there are varying reasons why people join groups.

Identify and describe two of the reasons why people join groups and provide an example of each.

Communication serves four major functions within a group or organization:
control, motivation, emotional expression, and information.

Provide an example that illustrates one of these from your personal experience, explaining the situation, the role of communication and the result.

Provide an example (real or fiction) of such behavior and suggests ways in which a group leader may manage this problem to reduce conflict in the group

Briefly explain.