[2] In 1908, along with Tomás Herreros Miguel, he took part in the eight-month strike against the Radical Republican Party's newspaper El Progreso.

[2][1] During the founding congress of the National Confederation of Labor (Spanish: Confederación Nacional del Trabajo, CNT), on 19 November 1910 Negre was elected as the union's first General Secretary.

[1] After his release, in 1913 he attended the First International Syndicalist Congress, held in London from 27 September to 2 October, where he made his speech in Valencian.

[1] In 1916 he became the editor and director of the CNT's newspaper Solidaridad Obrera, but he left active militancy in 1917[2] after Salvador Seguí i Rubinat, Salvador Quemades and Manuel Buenacasa Tomeo publicly accused him of being sympathetic to the Central Powers and of associating with the German embassy.

[2][1] During the Spanish Civil War he collaborated in propaganda campaigns of the Union of Iron and Steel Industries, and at the end of the conflict he went into exile in France.