In 1945, the establishment of new parties was allowed. The most powerful party established during this period was the Democrat Party (Demokrat Parti-DP). The four founders of the party, Celal Bayar, Adnan Menderes, Refik Koraltan and Fuat Köprülü, were members of the Parliament as the Republican People’s Party (Cumhuriyet Halk Partisi-CHP) deputies. In other words, the opposition was born in the CHP itself.