If theories of power tell us where authority ultimately lies, the study of political institutions tells us how it is organised and exercised day to day. Four institutions dominate the syllabus — the power elite, bureaucracy, pressure groups and political parties. Read together, they reveal a recurring sociological insight: modern politics, however democratic in form, tends to concentrate effective control in the hands of organised minorities.

C. Wright Mills and the power elite

In The Power Elite (1956), C. Wright Mills argued that decisive power in the United States had become lodged in a coalition occupying the command posts of three interlocking hierarchies — the corporate, the political (the executive) and the military. The members of this elite share social origins, education, club memberships and an interchange of personnel, giving them a cohesion that lets them take the big decisions while the mass of citizens remains politically inert.

Mills is best understood as a critical bridge between classical elite theory and Marxism. Unlike the pluralists, he denied that competing groups balance one another; unlike orthodox Marxists, he located power in institutional command rather than in ownership alone. His work is often paired with Floyd Hunter's community-power studies and criticised by Robert Dahl's pluralist rejoinder that no such unified elite could be demonstrated empirically.

Bureaucracy

Every modern institution — corporate, political and military alike — runs on bureaucracy, and here Max Weber remains indispensable. Weber saw bureaucracy as the organisational form of rational-legal authority and the most technically efficient means yet devised for administering large-scale tasks. His ideal type lists its defining features:

  • A hierarchy of offices with clearly defined jurisdictions.
  • Written rules and files governing conduct.
  • Appointment and promotion by qualification and merit.
  • The separation of the office from the private life and property of the official.
  • Impersonality — treating cases sine ira et studio, without hatred or passion.

Weber was ambivalent about this triumph of instrumental reason. Efficient administration threatened to become an iron cage that traps modern humanity in an ever more rationalised order, and he feared the rule of officials could hollow out political leadership and freedom. Later critics extended the analysis: Robert Merton exposed bureaucratic dysfunctions and the ritualistic displacement of goals, while Alvin Gouldner and Peter Blau documented informal practices that the ideal type overlooks.

Pressure groups and interest groups

Between the citizen and the state stand pressure groups — associations that seek to influence policy without themselves seeking office. Sociologists distinguish sectional (or protective) groups, which defend the material interests of a section such as trade unions and business federations, from promotional (or cause) groups, which campaign for a value or principle open to anyone who shares it. A further distinction separates insider groups, consulted routinely by government, from outsider groups reliant on public campaigning.

Pluralists celebrate such groups as the connective tissue of democracy, dispersing power and channelling diverse interests. Critics reply that access is deeply unequal — well-resourced business lobbies far outweigh diffuse public interests, a point sharpened by Mancur Olson's analysis of the logic of collective action and the free-rider problem, and by corporatist accounts in which the state privileges a few peak associations.

Political parties and the iron law of oligarchy

Political parties aggregate interests, contest elections and organise government. Weber treated the party as a vehicle for the pursuit of power within an association, and traced the rise of the professional party machine. It is Robert Michels, however, who supplies the syllabus's central theorem. Studying the German Social Democratic Party — the most internally democratic party of its day — Michels concluded that oligarchy is unavoidable. His iron law of oligarchy holds that who says organisation says oligarchy: the technical need for leadership, the expertise and control of communication that leaders accumulate, and the political passivity of the rank and file combine so that even avowedly democratic parties come to be run by a self-perpetuating few.

Michels thus completes the circle begun by Pareto and Mosca and echoed by Mills — organisation itself breeds elite rule. Critics counter that the law is too deterministic, that internal factions and democratic reforms can check leaders, and that party competition still gives voters real leverage.

How to use this in the exam

Frame this topic around a single thread — the tension between the democratic form of modern institutions and their oligarchic tendency. Use Mills to show elite concentration, Weber to explain why bureaucracy both enables and endangers democracy, pressure groups to stage the pluralist-versus-elitist debate, and Michels to clinch the argument that organisation breeds oligarchy. Marks come from linkage: point out how the same logic recurs across all four institutions, and balance each claim with its principal criticism to display analytical range rather than description.