Lewis Hine was a photographer and social reformer who joined up with the National Child Labor Committee and documented the exploitation of children in mills, factories and mines across American. His photographs of tired, dirty and uneducated little urchins working at urchin-devouring spinners, looms, presses and all manner of industrial mayhem are still moving. Alas, today one can turn to Sebastião Salgado for depressingly similar images taken around the world. For his part, Hine later documented immigrants at Ellis Island, landscapes in Florida and the construction of the Empire State Building in New York. A quick Google search for Chase Mill, or Winooski Falls Mill District will turn up some of his pictures. Or you could just look up Lewis Hine.