Late in his career, he was opposed by two so-called interparty governments led by John Costello.
This politician used the Public Safety Act against the Blue Shirts. Late in his career, he was opposed by two so-called interparty governments led by John Costello. Two years after losing an election to William (*) Cosgrave, he won the presidency on a platform that advocated for abolition of an oath. Cosgrave's government had previously imprisoned this founder of the Republican Society, who became prime minister in 1932 under the presidency of Douglas Hyde and regained that position in 1948  after Costello's government declared his nation's official independence. For 10 points, identify this politician who founded the Fiana Fail party and led Ireland throughout much of the middle of the 20th century.
This politician used the Public Safety Act against the Blue Shirts.
Eamon de Valera [or Edward de Valera]