Pierre Julien Henri Istre was a French engineer and radical politician. Istre served as a First Class Engineer of the General Cadre of Public Works of Overseas France.Boireau, R. L.. Guide pratique de Brazzaville. Société nationale des entreprises de presse, 1953. pp. 117-119Union française. R. Julliard., 1953. p. 379 He belonged to the Rally of Republican Lefts (RGR). He was elected from the First College (Europeans) to the Moyen-Congo Territorial Assembly in the 1952 election. He was subsequently elected to represent Moyen-Congo in the Grand Council of French Equatorial Africa.Wagret, Jean-Michel. Histoire et sociologie politique de la République du Congo (Brazzaville). N.p., FeniXX réédition numérique, 1963. p. 237 In April 1954 Istre was put forth by Jean Félix-Tchicaya as candidate for the presidency of the Moyen-Congo Territorial Assembly. But there was a rift in Félix-Tchicaya's party (the Congolese Progressive Party, PPC), and Pierre Goura defeated Istre with support from PPC dissidents.Gauze, René. The Politics of Congo-Brazzaville. Hoover Institution Press, 1973. p. 17

Istre contested the 1956 French National Assembly election, as a candidate for the First College in Gabon and Moyen-Congo. He obtained 120 votes (2% of the votes cast).Bernhard Vogel, Dieter Nohlen, Dolf Sternberger, Klaus Landfried. Afrika: Politische Organisation und Repräsentation in Afrika. De Gruyter, 2019. p. 1048L'Année politique, économique, sociale et diplomatique en France. Presses Universitaires de France, 1957. p. 576

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