The Centre Union (EK, Greek: Ένωσις Κέντρου, Enosis Kentrou) was a Greek political party, created in 1961 by George Papandreou, senior.The party was elected to power in 1963, with Papandreou as Prime Minister. In 1965, King Constantine forced Papandreou from the office following the Apostasia of 1965 plan, designed by him and executed by Center Union's politician Konstantinos Mitsotakis.