The Grabow riot or Grabow massacre was a violent confrontation that took place between private police hired by management and labor factions in the timber industry near Grabow (Graybow), Louisiana, on July 7, 1912. The clash left three union workers and a company security employee dead, including union leader Asbury Decatur ("Kate") Hall, and an estimated fifty wounded. It was a crucial event in attempts to organize locals and unionize sawmill workers in Louisiana and east Texas in a series of events known as the Louisiana-Texas Lumber War of 1911-1912.