Solidaridad Obrera (historical union)

Workers' Solidarity (Spanish: Solidaridad Obrera; Catalan: Solidaritat Obrera; SO) was a regional federation of trade unions in Catalonia. Established in 1907, following a series of unsuccessful attempts to establish a national trade union centre in Spain, SO united many of Barcelona's disparate anarchist and socialist trade unions into a single federation. The two factions of the organisation struggled to influence it in their favoured direction, while also clashing with the Radical Republican Party (PRR). In 1909, SO organised a general strike in Catalonia, which escalated into an insurrection known as the Tragic Week. The organisation was suppressed in the wake of the uprising, but managed to reorganise itself following the rise to power of a liberal government. In 1910, it merged together with other regional trade union federations into the National Confederation of Labour (CNT).