National Radical Union
Defunct ERE was a conservative, right-wing party, which also had some prominent centrist members, such as: Karamanlis resigned from the leadership of ERE in 1963 and was succeeded by Panagiotis Kanellopoulos.But the opposition Centre Union and United Democratic Left accused the government of Karamanlis of massive fraud, did not acknowledge the result, and Centre Union's leader George Papandreou organised massive demonstrations ("uncompromising struggle") and called for new elections.Karamanlis felt gravely insulted and resigned from the Premiership and the leadership of the party.New elections were held in 1963 where ERE lost, and a year later, in 1964 which the Centre Union won with the second highest percentage in Greek history, 54 percent of the vote.Kanellopoulos remained leader of the party until 1967, when he formed a government which did not last more than a month, as it was overthrown by the Greek military junta of 1967–1974.