National Progressive Center Union

The National Progressive Center Union (Greek Εθνική Προοδευτική Ένωσης Κέντρου), also known by its initials EPEK (ΕΠΕΚ), was a political party founded in January of 1950 by former general Nikolaos Plastiras. Its covered the centre of the political spectrum and had as its motto the single word "Change!".

In the March 5, 1950 elections, EPEK elected 45 MPs, polling 16.4% of the vote. It formed a coalition government, on April 15, with the Liberal Party of Sofoklis Venizelos and the Democratic Socialist Party of Georgios Papandreou. The government, under Plastiras, lasted until August of the same year.

In 1952, many of its left-wing members quit the party to form

On March 4, 1953, EPEK dissolved as Plastiras health was failing.