The Coal Strike of 1902 was a strike by the United Mine Workers of America in the anthracite coal

Anthracite coal

Anthracite is a hard, compact variety of mineral coal that has a high luster...

 fields of eastern Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

. Miners were on strike asking for higher wages, shorter workdays, and the recognition of their union. The strike threatened to shut down the winter fuel supply to all major cities (homes and apartments were heated with anthracite or "hard" coal because it had higher heat value and less smoke than "soft" or bituminous coal

Bituminous coal

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but of poorer quality than Anthracite...

).