This month marks the centenary of the Ludlow Massacre when US national guardsmen killed 20 striking miners and their families in Colorado. This is the story of one of the most violent episodes in American labour history.
On 20 April 1914 the US National Guard attacked a tent colony of striking miners at Ludlow in Southern Colorado. By the end of the day at least 20 strikers, their wives and children were dead. Thirteen had died in a pit dug underneath a tent where they were sheltering from the gunfire after the militiamen deliberately set fire to the tents.