Solidaridad Obrera (Spanish for Workers' Solidarity) is a newspaper, published by the Catalan/Balearic regional section of the anarchist labor union Confederación Nacional del Trabajo (CNT), and mouthpiece of the CNT in Spain.
The paper takes its name from an organization of the same name that started in 1907 and reorganized the labor movement in Spain based on the structure of the Federación de Trabajadores de la Región Española (FTRE). This name has been used by numerous anarchist periodicals in several countries.
The newspaper Solidaridad Obrera was first published on 19 October 1907, in Barcelona, Catalonia (Spain) as the mouthpiece of the Solidaridad Obrera federation and has been published, in different forms up to today, now consisting of an online version as well as a print-version that has a print-run of 5,000 copies that have been distributed for free since 2005.
The paper was first established by Anselmo Lorenzo, Ricardo Mella, and José Prat among others. It has been alleged that Francisco Ferrer provided economic support, though nothing conclusive has been proven.
Throughout its history, Solidaridad Obrera has had troubles with the authorities. Publication was suspended on 30 November 1907, but resumed the following February. In 1918, following a major recruitment drive by the CNT, the government shut down publication for a brief period. In 1919, publication was moved to Valencia from Barcelona, though it was moved back to Barcelona in 1923, only to be banned the following year by Prime Minister Miguel Primo de Rivera. After de Rivera stepped down, the Second Spanish Republic was founded, and the paper resumed publication on 31 August 1930 with economic help from anarchists of Manresa, Spain, and their own printing press. At this time the paper was being edited by Joan Peiró, and had a press-run of 26,000 copies. In September 1931, the paper took a new direction when it was taken over by members of the FAI, after a confrontation between more moderate treintistas and the anarchists of the FAI, going through seven editors in a matter of fourteen months.