The George Eastman House has an online exhibit of Lewis Hine's work titled "Let Children Be Children: Lewis Wickes Hine's Crusade Against Child Labor". Take a look. Images such as "Little Spinner in Mill, Augusta, GA" and Breaker boys in coal chute, South Pittston, Pennsylvania are both striking and disturbing.
Next, stop by the Child Labor Education and Action Project and find out more about child labor in the modern world.
Ernster, the Virtual Library Cat