July 23

Anarchist Alexander Berkman shoots and stabs but fails to kill steel magnate Henry Clay Frick in an effort to avenge the Homestead massacre 18 days earlier, in which nine strikers were killed. Berkman also tried to use what was, in effect, a suicide bomb, but it didn't detonate - 1892
 
Northern Michigan copper miners strike for union recognition, higher wages and 8-hour day. By the time they threw in the towel the following April, 1,100 had been arrested on various charges and Western Federation of Miners President Charles Moyer had been shot, beaten and forced out of town - 1913
 
Aluminum Workers Int'l Union merges with The United Brick & Clay Workers of America to form Aluminum, Brick & Clay Workers - 1981