1892 Coeur d'Alene labor strike

The 1892 Coeur d'Alene labor strike erupted in violence when labor union miners discovered they had been infiltrated by a Pinkerton agent who had routinely provided union information to the mine owners. The response to the labor violence, disastrous for the local miners' union, became the primary motivation for the formation of the Western Federation of Miners (WFM) the following year.