An explosion in the Darr Mine in Westmoreland Co., Pa., kills 239 coal miners. Seventy-one of the dead share a common grave in Olive Branch Cemetery. December 1907 was the worst month in U.S. coal mining history, with more than 3,000 dead - 1907
The National Civic Federation is formed by business and labor leaders, most prominently AFL president Sam Gompers, as a vehicle to resolve conflicts between management and labor. Not all unionists agreed with the alliance. The group turned increasingly conservative and labor withdrew after Gompers? 1924 death - 1900