1917 Spanish general strike
The 1917 Spanish general strike, or revolutionary general strike of 1917, took place in Spain in August 1917. It was called by the General Union of Workers (UGT) and the Spanish Socialist Workers' Party (PSOE), and in some places it was supported by the National Confederation of Labor (CNT).
Source: Wikipedia — 1917 Spanish general strike (CC BY-SA 4.0)