Meridor was one of the founders of Herut and was elected to the Knesset in Israel's first elections. He retained his seat in elections in 1951, 1955, 1959, 1961 and again in 1965 after Herut had merged with the Liberal Party to form Gahal (which later became Likud). He also published a book in 1955, entitled Long is the Path to Freedom: Chronicles of one of the Exiles.