Child labor photos from the Library of Congress

There's a huge collection of these at the Library of Congress - the National Child Labor Committee Collection:

Founded in 1904, the National Child Labor Committee set out on a mission of "promoting the rights, awareness, dignity, well-being and education of children and youth as they relate to work and working." Starting in 1908, the Committee hired Lewis W. Hine (1874-1940), first on a temporary and then on a permanent basis, to carry out investigative and photographic work for the organization.

The book Kids at Work: Lewis Hine and the Crusade Against Child Labor is a photobiography of Lewis Hine, using his own work as illustrations.  Related books available here.

Amos is 6 and Horace 4 years old. Their father, John Neal is a renter and raises tobacco. He said (and the owner of the land confirmed it) that both these boys work day after day from "sun-up to sun-down" worming and suckering, and that they are as steady as a grown-up. Location: Warren County--Albaton, Kentucky

Some of the young cartoners in work room, Seacoast Canning Co., Factory #2. Five year old Preston working also. Location: Eastport, Maine.

"Boy Wanted" Sign. West 19[th] Street. Location: New York, New York (State) / L.W. Hine.

Night Shift Leaving for Home: Indiana Glass Works, 8:00 A. M., (See also Photo #91.) Location: Indiana.

Name: Norris Lovitt. Been picking for 3 years in berry fields near Baltimore, Md. July 8, 1909. Location: Baltimore, Maryland.

Callie Campbell, 11 years old, picks 75 to 125 pounds of cotton a day, and totes 50 pounds of it when sack gets full. "No, I don't like it very much." Location: [Potawotamie County, Oklahoma].

9 year old girl carrying garments down Blackstone Street, Boston, Mass., to a Hanover Street home. She finishes 8 pairs of trousers a day and gets 8 cents a piece. Location: Boston, Massachusetts.