The operation of the European Coal and Steel Community (E.C.S.C.), the European Atomic Energy Community (Euratom), and the European Economic Community (E.E.C.)-established by France, the Federal Republic of Germany, Italy, Belgium, the Netherlands, and Luxembourg-undoubtedly affects enterprises located within the territories of these Communities. This raises the question to what extent enterprises and establishments, partly or totally owned by foreign corporations-i.e., corporations outside the Communities-may come under Community jurisdiction. The concept of enterprise is to be examined from this aspect-a problem closely related to the question of competence of the Communities1 and of the jurisdiction of the Community Court.2 The primary problem centers around the question of competence of the quasi-legislative and administrative powers of the Communities. The present exposition attempts to analyze some features of this complex and somewhat unexplored question. It will, however, merely touch on the jurisdiction of the Community Court and the parties that may invoke its protection,3 since this question appears reasonably clear. Moreover, the judicial control as invoked by a party's appeal for annulment or against inaction represents a broader question whose discussion would greatly exceed the scope of this paper. Member States as well as private parties under Community jurisdiction may appeal before the Community Court allegedly illegal acts of a Community organ or its failure to act.4 The Treaties, of course, differentiate between appeals of Member States and of private parties, and grant to States a more extensive right of appeal. In specific instances, even third parties outside Community jurisdiction may appeal.5 The Communities exercise some powers directly over the enterprises, and it is, there-