More than 4,500 members and supporters of the United Mine Workers marched and rallied in downtown St. Louis on May 21.
Mine workers are now demanding criminal prosecution of 18 Massey Coal Company executives - including retired CEO Don Blankenship - for "industrial homicide."
The indictment of the security supervisor at Massey Energy's Upper Big Branch will be the first of many indictments after an explosion killed 29 West Virginia miners.
Mine workers welcome Obama's plan to make it easier in cracking down on coal companies that are constant safety violators. However specific rules need to be enforced in order to further erode the systemic problem, unions say.