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 detournement de pouvoir — Dominant purpose of Treaty — Meaning of concept of “common Interest” in Article 3 — Article 4 (b) and (c) — Whether financial arrangement under Article 53 can be special charge within Article 4 (c) — Unequal imposition of charges — Article 65 — Whether acts of High Authority more restrictive than necessary for their purpose.