FILE - In this May 30, 1937 file photo police using guns, clubs and tear gas confront marching strikers outside Chicago's Republic Steel plant during violent clashes in the early days o

 

              FILE - In this May 30, 1937 file photo police using guns, clubs and tear gas confront marching strikers outside Chicago
FILE - In this May 30, 1937 file photo police using guns, clubs and tear gas confront marching strikers outside Chicago's Republic Steel plant during violent clashes in the early days of labor union organizations. (AP Photo/Carl Linde, File)