A group agent is an agent which may represent two or more persons, or personal agents, in an official context.
A group agent is a specialized type of collective, or collective activity, which collects official consent in one or more specific contexts. I.e., a specific collective might act as a group agent in some contexts, but probably not in all contexts.
People often use group agents to determine the assignment or distribution of resources in a social context.
Group agents, including many governing forms, have been fundamental to the development of social, cultural, economic and political forces and forms on most hierarchical levels.