The third unit of grade 12 of the FICSS series (Focus on Inner City Social Studies -- see SO 008 271) examines the role of business, industry, and labor and how they interact with the government and the military. The unit deals with the concepts of power theory, corporation, corporate power, unions, union power, and mass society. Power theory models which may be useful in analyzing institutions and their wielding of power are introduced. The content of the unit includes an introduction; essential source materials; knowledge, skill, and behavioral objectives; learning activities; and supplementary resource materials for both students and teachers. (JR)