born Feb. 9, 1891, Faenza, Italy

died Jan. 1, 1980, Rome

journalist and politician who was leader of the Italian Socialist Party (PSI), twice foreign minister, and several times vice-premier of Italy.

The son of a peasant, Nenni first became a journalist. When Italy invaded Libya in September 1911, Nenni organized a strike against the campaign. He was jailed for his activities and met Benito Mussolini (Mussolini, Benito) in prison. He joined the PSI in 1921. In 1922, when Mussolini came to power, Nenni, an ardent antifascist, attacked him in the newspaper Avanti, of which he was chief editor. In 1925 he was arrested for publishing a booklet on the Fascists' murder of Socialist leader Giacomo Matteotti, and in the following year, after the suppression of Avanti, he fled to Paris. During the Spanish Civil War, Nenni was cofounder and political commissar of the Garibaldi Brigade. In 1940 he was arrested in Vichy France by the German Gestapo, taken back to Italy in 1943, and interned on the island of Ponza by Mussolini. In August of the same year, he was released by order of Marshal Pietro Badoglio. Nenni was then elected secretary-general of the PSI and in 1945 became vice-premier in the government of Feruccio Parri. Elected to the Constituent Assembly in 1946, he became vice-premier again in Christian Democrat Alcide De Gasperi's coalition government. In 1946 Nenni was named foreign minister, but in January 1947 the PSI split and Nenni, heading the party's left wing, made an alliance with the Communists. For almost a decade the alliance opposed Christian Democrat governments.

Two studies are Giuseppe Tamburrano, Pietro Nenni (1986); and Enzo Santarelli, Pietro Nenni (1988).