[1][2][3][4] During the Second World War, Coste-Floret was active in the French Resistance.

[5] He also advised André Philip and François de Menthon, ministers in the Free French provisional government.

[4] He was elected as a député to the Assemblée Nationale in 1946 as a member of the Mouvement Républicain Populaire, for the department of Hérault, and served until 1958.

[6] He was nominated by the president of the Senate, Alain Poher, to the Conseil constitutionnel from 23 February 1971, and served on this until his death.

[4] As minister of the French Overseas Territories, Coste-Floret worked on the Halong Bay Agreements (Accords de la baie d’Along) in 1949.