In 1914, a battle between striking coal miners and a Rockefeller-owned mining company claimed 20 lives, and went down in history as part of the epic struggle between capitalist and laborer. But the story of the Ludlow Massacre can be told a different way. Host Bruce Gellerman talks with Thomas G. Andrews about his new book “Killing for Coal” and about the role that coal played in setting the scene for America’s bloodiest labor war.