The first full account of why the American workplace became so dangerous, and why it is now so much safer. In 1907, American coal mines killed 3,242 men in occupational accidents, probably an all-time high both for the industry and for all laboring accidents in this country. In December alone, two mines at Monongah, West Virginia, blew up, killing 362 men. Railroad accidents that same year killed another 4,534. At a single South Chicago...