[Jean Léon]. French Socialist leader, born at Castres (Tarn) on the 3rd of September 1859. He was educated at the lycée Louis-le-Grand and the école normale supérieure, and took his degree as associate in philosophy in 1881. After teaching philosophy for two years at the lycée of Albi (Tarn), he lectured at the university of Toulouse. He was elected republican deputy for the department of Tarn in 1885. In 1889, after unsuccessfully contesting Castres, he returned to his professional duties at Toulouse, where he took an active interest in municipal affairs, and helped to found the medical faculty of the university. He also prepared two theses for his doctorate in philosophy, De primis socialismi germanici lineamentis apud Lutherum, Kant, Fichte et Hegel (1891), and De la réalité du monde sensible. In 1902 he gave energetic support to the miners of Carmaux who went out on strike in consequence of the dismissal of a socialist workman, Calvignac; and in the next year he was re-elected to the chamber as deputy for Albi. Although he was defeated at the elections of 1898 and was for four years outside the chamber, his eloquent speeches made him a force in politics as an intellectual champion of socialism. He edited the Petite République, and was one of the most energetic defenders of Captain Alfred Dreyfus. He approved of the inclusion of M. Millerand, the socialist, in the Waldeck-Rousseau ministry, though this led to a split with the more revolutionary section led by M. Guesde. In 1902 he was again returned as deputy for Albi, and during the Combes administration his influence secured the coherence of the radical-socialist coalition known as the bloc. In 1904 he founded the socialist paper, L’Humanité. The French socialist groups held a congress at Rouen in March 1905, which resulted in a new consolidation; the new party, headed by MM. Jaurès and Guesde, ceased to cooperate with the radicals and radical-socialists, and became known as the unified socialists, pledged to advance a collectivist programme. At the general elections of 1906 M. Jaurès was again elected for the Tarn. His ability and vigour were now generally recognized; but the strength of the socialist party, and the practical activity of its leader, still had to reckon with the equally practical and vigorous liberalism of M. Clemenceau. The latter was able to appeal to his countrymen (in a notable speech in the spring of 1906) to rally to a radical programme which had no socialist Utopia in view; and the appearance in him of a strong and practical radical leader had the result of considerably diminishing the effect of the socialist propaganda. M. Jaurès, in addition to his daily journalistic activity, published Les preuves; affaire Dreyfus (1900); Action socialiste (1899); Études socialistes (1902), and, with other collaborators, Histoire socialiste (1901), &c.
He was already in 1910 the recognized leader of the Unified Socialists in the Chamber of Deputies. He continued to play a prominent part in International Socialist politics, striving to arrange concerted action of the working classes to make wars impossible by means of general strikes. He was the most active and effective critic of the three-years Military Service Law and other measures by which France sought in 1913 to meet German war preparations. He was assassinated on the 31st of July 1914.
