Soon after he took office as president, teddy roosevelt intervened in the strike.

The Coal Strike of 1902 or the Anthracite Coal Strike was a strike by the United Mine Workers of America in the anthracite coal fields of Eastern Pennsylvania.  The strike threatened to shut down winter fuel supplies for the surrounding areas which led to Roosevelt getting involved. He helped to set up a commission to investigate the strike and the conditions that the workers were striking for which helped to end the strike. The strike ended and never commenced again and the laborers were paid higher wages for less hours. 

Acase involving the laws of a single state.