The Baldwin–Felts Detective Agency was a private detective agency in the United States from the early 1890s to 1937. Members of the agency were central actors in the events that led to the Battle of Blair Mountain in 1921 and violent repression of labor union members as part of the Coal Wars in such places as the Pocahontas Coalfield region of West Virginia, the Paint Creek–Cabin Creek strike of 1912 in West Virginia, 1913–1914 Colorado Coalfield War (including the Ludlow Massacre in 1914), and the Battle of Matewan in 1920.