The 1922 UMW Miner strike was a nationwide strike of miners in the US that occurred after a United Mine Workers (UMW) trade union contract expired on March 31, 1922. The strike was declared on April 1. Around 610,000 mine workers struck that year, notably 155,000 anthracite and 155,000 bituminous miners. A notable historical event connected to the strike is the Herrin massacre. The strike also led to the foundation of the Federal Coal Commission in September 1922. A contract was reached on September 2, 1922 which covered members the UMW. It extended the agreement terms of the previous contract to August 31,1923. After ratification, mining resumed on September 11. The general coal strike lasted 163 days. However nearly 70,000 un-unionized mining workers were not covered by the UMW contract. After the UMW ended their strike, around 25,000 Windber, Pennsylvania miners continued striking. Until miners voted to end it on August 14, 1923, after failing to gain a contract. References Miners' labor disputes in the United States 1922 in the United States Labor history of the United States