International organization — European Coal and Steel Community — Interpretation of Treaty establishing — Articles setting out fundamental aims of Treaty to be read as a whole — Power of international organization to give predominance to certain of these aims — Interpretation of fundamental aims in light of subsequent provision of Treaty — Effect of failure to comply with fundamental aims — Whether a détournement de pouvoir — General decision challenged by enterprise — Necessity of showing détournement de pouvoir with respect to that enterprise — Relevance of alleged aim of Authority to penalise a particular enterprise.