Confederación Sindical Solidaridad Obrera

Solidaridad Obrera (Labour Solidarity) is a small anarcho-syndicalist labour union federation that appeared in Madrid, Spain in 1990 as a split from the Confederación General del Trabajo (CGT), itself a split from the Confederación Nacional del Trabajo (CNT), the Spanish member of the International Workers Association (IWA). Its founders did not accept resolutions made by the CGT congress in 1989. https://en.wikipedia.org/wiki/Solidaridad_Obrera_(union)