Coal mining is dangerous.
On April 20, 1914, it was deadly.
Miners in the Rockefeller-owned Colorado coal fields clashed with the state militia and dozens of men, women and children were killed.
It was a classic battle between workers who wanted a say in their workplace, and corporations that didn't want to yield power.
Woody Guthrie even wrote a song about it.
History professor Andrew Thomas of the University of Colorado tells the story of the battle in his book, "Killing for Coal: America's Deadliest Labor War." He spoke Feb. 20 at the Minnesota Historical Society's "History Forum."
Listen to the talk by using the audio player above.
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