As already pointed out, the Court enjoys a wide, and above all manifold, jurisdiction. Controlling the exercise of administrative powers, it operates in the role of an administrative tribunal which examines the legality of administration. But the Court also controls the exercise of quasi-legislative powers. As a guardian of the Community Treaties the Court already displays strong elements of a constitutional court. But its role as a constitutional court may be best demonstrated by the cases in which the Court examines the fundamental principles of the Treaties, upon which the Communities are built. The broad formulation of these principles, which are to be observed by the Member States and the Community organs alike, gives the Court considerable latitude in its expression of Community policy. In these instances the control of the Court goes beyond a strict control of legality; it exercises a rudimentary political control in favour of the fundamental principles of the Treaties.
The acts and measures of the Community may inadvertedly affect the relations of the Member States among themselves or with the Community. These acts and measures are so different in their origin, nature and purpose as well as in their effects that it is difficult to bring them under a common denominator. Common to all of them is that they are under a judicial control which may be invoked by a Member State or a Community organ, as the case may be. This already indicates that these acts and measures deal with matters of cardinal importance.
If the nature of the Community powers as expressed in the act or measure taken is considered, the Court may control: (1) detrimental economic effects in a Member State; (2) Treaty violation by a Member State and imposition of sanctions; (3) amendment of the ECSC Treaty, (4) treaty making power of the EEC, a Community control which by its nature and purpose stands entirely aside; and (5) Euratom control over the