Two songs by Woody Guthrie that I guess could be called "industrial/labor" murders. Both invole the deaths of innocent small children, which has to give rise to the saddest songs of all!
    The first song commerates actions by the Colorado National Guard against striking mine workers -- The Ludlow Massacre.
    The second, that name of which I can't remember, took place in the Upper Penninsula of Michigan on Christmas Eve, when scabs blocked the meeting house door and yelled "Fire."