"Which Side Are You On?" is a song written by Florence Reece in 1931. Reece was the wife of Sam Reece, a union organizer for the United Mine Workers in Harlan County, Kentucky. In 1931, the miners of that region were locked in a bitter and violent struggle with the mine owners. In an attempt to intimidate the Reece family, Sheriff J. H. Blair and his men (hired by the mining company) illegally entered their family home in search of Sam Reece. Sam had been warned in advance and escaped, but Florence and their children were terrorized in his place. That night, after the men had gone, Florence wrote the lyrics to "Which Side Are You On?" on a calendar that hung in the kitchen of her home. She took the melody from a traditional Baptist hymn, "Lay the Lily Low", or the traditional ballad "Jack Munro". Florence recorded the song, which can be heard on the CD Coal Mining Women.
Not a big fan of Natalie Merchant but I love her version of this song.