Constitutionalism

Constitutionalism emerged as a reaction to functionalism to rebut the international nature of the relation between organizations and member states: member states are organs of the organization when they act in the fulfilment of its purposes; the law created by international organizations is purely internal law; the institutional veil is characterized by an impermeable opacity; the autonomy of the organization is maximal; the conduct of a member state acting in the institutional forum is not relevant as a matter of international law. This chapter describes the historical roots of this conceptualization and posits why under this perspective the rules of the organizations are internal law of each particular organization. Afterwards, it describes the flaws of this theory discussing the problems arising in terms of the principle of lex specialis and concerning the attribution of conduct to an international organization.