Today in Labor History June 22 Violence erupted during a coal mine strike at Herrin, Ill. 36 killed

[Omaha Steve]

June 22

Violence erupted during a coal mine strike at Herrin, Ill. Thirty-six were killed, 21 of them non-union miners - 1922

And this:
June 22, 1922 - In what became known as the “Herrin Massacre,” a group of several hundred striking miners seized a group of strikebreakers who had been brought in by the Southern Illinois Coal Company. The strikers marched the strikebreakers to a woods near Herrin, Illinois, and opened fire, killing 19. Several strikers were held in the Williamson County jail, which has been turned into a historical museum focusing on the conflict. The St. Louis Globe-Democrat called the shootings “the most brutal and horrifying crime that has ever stained the garments of organized labor.”

Labor history found here: http://www.unionist.com/today-in-labor-history & http://www.workdayminnesota.org/index.php?history_9_06_22_2011