Question: Who wrote there is power in a union?

Disambiguated questions and answers:
context: The song has been recorded several times. Billy Bragg recorded a song with the title "There Is Power in a Union" on the "Talking with the Taxman About Poetry" album; this has different words and is set to the tune of "Battle Cry of Freedom".
question: Who wrote a song based upon the music of "Battle Cry of Freedom" called "There is Power in a Union"?
short_answers: Billy Bragg
wikipage: There Is Power in a Union
context: "There Is Power in a Union" is a song written by Joe Hill in 1913. The Industrial Workers of the World (commonly known as the Wobblies) concentrated much of its labor trying to organize migrant workers in lumber and construction camps. They sometimes had competition for the attention of the workers from religious organizations. The song uses the tune of Lewis E. Jones' 1899 hymn "There Is Power in the Blood (Of the Lamb)".
question: Who wrote the 1913 song "There is Power in a Union"?
short_answers: Joe Hill
wikipage: There Is Power in a Union

Long-form answers:
knowledge: content: The "Battle Cry of Freedom", also known as "Rally 'Round the Flag", is a song written in 1862 by American composer George Frederick Root (1820–1895) during the American Civil War. A patriotic song advocating the causes of Unionism and abolitionism, it became so popular that composer H. L. Schreiner and lyricist W. H. Barnes adapted it for the Confederacy.[1]
wikipage: Battle Cry of Freedom
content: Stephen William Bragg (born 20 December 1957) is an English singer-songwriter and left-wing activist.[2] His music blends elements of folk music, punk rock and protest songs, with lyrics that mostly span political or romantic themes. His music is heavily centred on bringing about change and involving the younger generation in activist causes.[3]
wikipage: Billy Bragg
content: Billy Bragg wrote a song based upon the music of "Battle Cry of Freedom" called "There Is Power in a Union" on the Talking with the Taxman about Poetry album.
wikipage: Battle Cry of Freedom
content: "There Is Power in a Union" is a song written by Joe Hill in 1913. The Industrial Workers of the World (commonly known as the Wobblies) concentrated much of its labor trying to organize migrant workers in lumber and construction camps. 
wikipage: There Is Power in a Union
content: The song has been recorded several times. Billy Bragg recorded a song with the title "There Is Power in a Union" on the Talking with the Taxman About Poetry album; this has different words[2] and is set to the tune of "Battle Cry of Freedom".
wikipage: There Is Power in a Union
content: The Billy Bragg song of this title, but unrelated to Joe Hill's song, is featured in the 2014 film Pride in which London organization Lesbians and Gays Support the Miners collects funds to support the striking miners of a Welsh pit village during the UK miners' strike (1984–85).
wikipage: There Is Power in a Union
long_answer: "There Is Power in a Union" is a song written by Joe Hill in 1913. The song has been recorded several times, including a version English singer-songwriter and activist Billy Bragg recorded with the title "There Is Power in a Union" on the Talking with the Taxman About Poetry album; this has different words and is set to the tune of "Battle Cry of Freedom". The "Battle Cry of Freedom", is a song written in 1862 by American composer George Frederick Root during the American Civil War and is a patriotic song advocating the causes of Unionism and abolitionism. The Billy Bragg song "There is Power in a Union" is featured in the 2014 film Pride in which London organization Lesbians and Gays Support the Miners collects funds to support the striking miners of a Welsh pit village during the UK miners' strike.