Florence Reece, was an American social activist, poet, and folksong writer, and is best known for the song "Which Side Are You On?", which she wrote in which year, during the Harlan County War, or Bloody Harlan, was a series of coal mining-related skirmishes, executions, bombings, and strikes (both attempted and realized) that took place in Harlan County, Kentucky, during the 1930s?