7) Client agencies are the agencies that exist principally to serve the needs of certain interest groups or clients. The first group to be created was: The Department of Agriculture The Department of Commerce The Department of Labor The Department of Financea. The Department of Agricultureb. The Department of Commercec. The Department of Labord. The Department of Finance Solution a. The Department of Agriculture Reason: This agency was set up to support the primary sector in the economy..