Through these photographs, Hine began to realise that documentary photography could be a tool for social change and reform.
In 1907, Hine was the staff photographer of the Russell Sage Foundation for whom he photographed people and life in steel-making districts of Pittsburgh.
One year later, he became the photographer for the National Child Labor Committee, leaving his teaching position.
Over the next decade, Hine photographed industrial conditions, revealing the extent to which children worked in the mills, mines, canneries and factories of the United States. Children from poor and migrant families, as young as five years old, were working long hours in dangerous and dirty conditions.
In many cases, photography was forbidden in mines and factories. These were scenes that weren’t meant to be seen; revealing these conditions was met with considerable opposition.
Hine adopted many personas - fire inspector, postcard vendor, bible salesman - so he could be allowed in, and travelled hundreds and thousands of miles taking almost 5,000 photographs.
These photographs supported the Committee's lobbying to end child labour, and inspired a wave of moral outrage. By 1912, a Children's Bureau in the Department of Labor and Department of Commerce had been created, following NCLC's lobbying. Finally, in 1938, the Fair Labor Standards Act was passed bringing child labour to an ultimate end.
Lewis Hine's photographs were instrumental in changing child labor laws in the United States. His photographs - whether of children working, migrants at Ellis Island or wider industrial conditions - emphasise the human side of modern industry and remain powerful today.
Europe at Work - Share your story
When you were a child, did you have to work? Share your story and help us tell the story of Europe through our working lives in the past and the present.