From wikipedia:
Alan Lomax, writing in the American Folk Song Book (1968), says "Florence Reece, a shy, towheaded Kentucky miner's daughter, composed this song at the age of 12 when her father was out on strike. She sang it me standing in front of the primitive hearth of a log cabin in the backwoods of Kentucky in 1937 and it has since become a national union song
I hear Peter Yarrow sang this yesterday in Madison.
And for Fireblossom, two versions of Union Maid:
