 Following the attacks, the 350 white miners went to the president of the Springfield United Mine Workers union, refusing to work with black miners, stating that they felt "unsafe" working with blacks underground.The mines shut down for several days, only re-opening when mine executives threatened to bring in black strikebreakers if the white miners did not resume work.Several other white employers also received letters in the mail, threatening their lives and property, if they did not dismiss their black employees or if they did business with blacks.