Addition of a new subsection to Article 29.4 of the Constitution:
Oireachtas debate
The Third Amendment of the Constitution Bill 1971 was introduced in the Dáil by Tánaiste Erskine H. Childers of Fianna Fáil. Among the opposition parties, it was supported by Fine Gael and opposed by the Labour Party. At the Second Stage debates, it was moved by TaoiseachJack Lynch. The Labour Party sought to defeat the reading of the bill at second stage; a government motion to prevent this passed by 106 votes to 17, and the bill proceeded to Committee Stage. At Committee Stage, the government accepted a Fine Gael amendment to the final sentence. As initiated, this sentence had begun, "No provision of this Constitution invalidates laws enacted, acts done or measures adopted by the State consequent on membership of the Communities "; the amendment replaced the words highlighted in bold with the words "necessitated by the obligations of". It passed all stages in the Dáil on 26 January 1972. It passed all stages in the Seanad on 8 March 1972.
Views on accession
As well as parties represented in the Oireachtas, accession was also supported by employers' and farmers' interest groups. President Éamon de Valera privately opposed the state's entry and voted 'no', citing the loss of sovereignty. The United Irishman newspaper opposed the state's entry. Official Sinn Féin also opposed the entry, citing anti-imperialism and calling the EC a "rich man's club" Provisional Sinn Féin also opposed the entry, saying it would undermine Irish sovereignty and that the "Common Market Empire would threaten Irish ownership of Irish land".
Result
The Third Amendment was approved with 81.1% in favour to 16.9% against. It was the first amendment to the Constitution to be approved by Irish voters in a referendum.
Aftermath and later developments
The European Communities Act 1972 was signed into law on 6 December 1972. This provided a legislative basis for the primacy and direct effect of European Community law. On 1 January 1973, Ireland, Denmark and the United Kingdom became member states of the European Communities. In Crotty v. An Taoiseach, the Supreme Court of Ireland held that further transfer of power to the European Communities that were not in themselves necessitated by membership of the European Communities would require further amendments to the Constitution, and therefore require approval by referendum. Subsequent changes to the Treaties of the European Communities and later of the European Union have also required amendments to the Constitution, and therefore have required approval by referendum. These amendments have substantially altered the initial wording of 29.4.3º as inserted by the Third Amendment. in particular, the Twenty-eighth Amendment of the Constitution of Ireland approved in 2009, allowing the ratification of the Treaty of Lisbon, created a different structure to the subsections in Article 29.4. In later years the various European organisations were integrated by the ratification of subsequent treaties into the European Union.