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This trio had a sign saying "Justice not Torture" as they played some beautiful, mournful melodies in a subway station in New York. They were getting the attention of commuters in order to collect signatures to protest against the torture meted out to prisoners in Guantanamo, Abu Ghraib, Afghanistan and other secret detention facilities around the world.
Their handout read, "Holding anyone without charge....is a violation of the US constitution and international law."
For more information go to this site (Center for Constitutional Rights) and click on Guantanamo Action Center.