The 1927 Indiana bituminous strike was a strike by members of the United Mine Workers of America (UMWA) against local bituminous coal companies. Although the struggle raged throughout most of the nation's coal fields, its most serious impact was in western Pennsylvania, including Indiana County. The strike began on April 1, 1927, when almost 200,000 coal miners struck the coal mining companies operating in the Central Competitive Field, after the two sides (management and labor) could not reach an agreement on pay rates. The UMWA was attempting to retain pay raises gained in the contracts it had negotiated in 1922 and 1924, while management, stating that it was under economic pressure from competition with the West Virginia coal mines, was seeking wage reductions. The strike proved to be