Today in Labor History April 3, 1891: Deputized members of the National Guard fired on immigrant strikers in the Morewood massacre, in Pennsylvania. They killed at least ten workers and injured dozens more. The workers were organized with the new United Mine Workers, and were fighting Henry Clay Frick, the same industrialist responsible for the massacre at Homestead the following year, and the man who anarchist Alexander Berkman attempted to assassinate, also in 1892.