European integration for greater transparency and trust among themselves. This transfer of national powers to a "Community" to be exercised by its Commission was paralleled under the 1957 Treaty of Rome establishing the European Atomic Energy Community (or Euratom) and the European Economic Community (EEC) in Brussels. In 1967, the Merger Treaty (or Brussels Treaty) combine the institutions of the ECSC and Euratom into that of the EEC. They already shared a Parliamentary Assembly and Courts. Collectively they were known as the European Communities. In 1987, the Single European Act (SEA) was the first major revision of the Treaty of Rome that
High Authority of the European Coal and Steel Community in Luxembourg's city hall on 10 August 1952. Jean Monnet, the architect of the ECSC, was elected as its first President. The supranational power exercised by the Authority did prompt suspicion by some, for example the government of France who ensured that in the European Economic Community (EEC) and European Atomic Energy Community (Euratom) more power would be in the hands of the Council. The Merger Treaty came into force in 1967; this combined the independent institutions of the ECSC and Euratom with those of the EEC. From that time the High Authority ceased to exist, its duties being taken