Labor Arts  
   Virtual museum exhibiting and cataloging the art of the labor movement and working people. Collections include parades, cartoon art on labor themes, and buttons and badges.
   http://www.laborarts.org/

Smithsonian Magazine: Hell's Bells  
   Includes several articles on labor conditions in the 19th century.
   http://www.smithsonianmag.si.edu/smithsonian/issues02/may02/object.html

Child Labour 1750-1850  
   Extensive treatment of the topic, from the Encyclopaedia of British History.
   http://www.spartacus.schoolnet.co.uk/IRchild.main.htm

Bread and Roses: The Lost Histories of a Slogan and a Poem  
   Long thought to have been inspired by the 1912 strike by textile workers in Lawrence, Massachusetts, James Oppenheim's poem was actually inspired by earlier labor struggles.
   http://www.boondocksnet.com/labor/history/bread_and_roses_history.html