have been governed by a statute supervised by a European Commissioner reporting to the Council of Ministers of the Western European Union. After the failed attempts at creating defence (European Defence Community) and political communities (European Political Community), leaders met at the Messina Conference and established the Spaak Committee which produced the Spaak report. The report was accepted at the Venice Conference (29 and 30 May 1956), which decided to organise an Intergovernmental Conference. The Intergovernmental Conference on the Common Market and Euratom focused on economic unity, leading to the Treaties of Rome being signed in 1957 - this established the European Economic Community (EEC) and the European Atomic Energy Community (Euratom) among the members. 1958–1972: Three communities The two new communities were created separately from ECSC, although they shared the same courts and the Common Assembly. The executives of the new communities were called Commissions, as opposed to the "High Authority". The EEC was headed by Walter Hallstein (Hallstein Commission) and Euratom was headed by Louis Armand (Armand Commission) and then Étienne Hirsch. Euratom would integrate sectors in nuclear energy while the EEC would develop a customs union between members. Throughout the 1960s tensions began to show with France seeking to limit supranational power and rejecting the membership of the United Kingdom. However, in 1965 an agreement was reached to merge the three communities under a single set of institutions, and hence the Merger Treaty was signed in Brussels and came into force on 1 July 1967 creating the European Communities. Jean Rey presided over the first merged Commission (Rey Commission). While the political progress of the Communities was hesitant in the 1960s, this was a fertile period for European legal integration. Many of the foundational legal doctrines of the Court of Justice were first established in landmark decisions during the 1960s and 1970s, above all in the Van Gend en Loos decision of 1963 that declared the "direct effect" of European law, that is to say, its enforceability before national courts by private parties. Other landmark decisions during this period included Costa v ENEL, which established the supremacy of European law over national law and the "Dairy Products" decision, which declared that general international law principles of reciprocity and retaliation were prohibited within the European Community. All three of these judgments were made after the appointment of French judge Robert Lecourt in 1962, and Lecourt appears to have