EU:The European Union is "a creation of powerful political, economic and bureaucratic elites, without popular legitimacy and authority", Mr Anthony Coughlan of the National Platform has declared.
"It is directed from the top down rather than the bottom up and is therefore fundamentally undemocratic. There is no European people, no European 'demos', no European 'we'."
In an eve-of-enlargement message, Mr Coughlan said the 10 new member-states joining this weekend in Dublin may help to break down "the political prison walls" that exist within the EU.
"Like inmates in our EU prison, we welcome new companions. We can be confident the new arrivals will help us in time to break down our political prison walls. At the same time, we do not wish on the 10 new accession countries the loss of national democracy and political independence they now face," he declared.
The referendums held in the new member-states were "travesties of democracy", he claimed, where public funding, mass media and referendum rules were "grotesquely unbalanced" in favour of EU accession.
"The EU Commission, ever anxious to increase its own power, interfered massively in favour of the Yes-side - almost certainly in breach of EU law, which gives the Commission no competence in treaty ratification.
"The result was that voters in the accession countries went to the polls in virtual total ignorance of the undemocratic, power-hungry, institutional monster they are joining next weekend," he said.
The lack of information about the European Union in advance of the referendum will make the public in the new member-states "all the more bitter" when "the inevitable disillusionment" occurs.
The new EU states have "got a thoroughly bad deal economically and politically", being forced to accept the EU's existing 80,000 pages of legal texts.
All of the new EU states have had to agree to accept the euro in the future, even though existing members Britain, Denmark and Sweden are not abolishing their currencies.
"When the east Europeans were client states of the USSR, the Russians never required them to adopt the rouble. Yet the EU 15 are insisting that they adopt the euro," Mr Coughlan said.
Politicians from the new member-states will now make laws in Brussels behind closed doors as members of an oligarchy of 25 persons on the EU Council of Ministers, responsible as a collectivity to no one.
"This is a huge increase in their personal power, while their national parliaments and peoples, which must obey these laws, are politically emasculated.
"This explains why national government ministers support this process. It is only a matter of time before the peoples of the accession countries will realise this and insist on re-establishing their democracy," he said.
However, Mr Coughlan said he believed that the arrival of the 10 new states would fundamentally alter the dynamic of the EU: "The enlargement is almost certainly the beginning of the end of Euro-federalism. Let us rejoice at that."
The EU's single currency deprives the poorer EU states and the weaker EU economy of the chance to maintain competitiveness or to compensate them for their lower productivity, or other economic weaknesses.
The EU spends just 1 per cent of the EU's annual Gross Domestic Product, a tiny relative figure, whereas the average member-states control 35 per cent of the Gross National Product of their own countries.