Mick Hartley

Lewis Hine photographed children at work on behalf of the National Child Labor Committee, as part of their (successful) campaign to change the US law on child labour. He's a regular feature at Shorpy. Here's the latest: October 1911 – boys working in Mule Room #1, Merrimac Cotton Mill, Lowell, Massachusetts:

Full size and more detail here.

The last time I saw those two characters on the left, they were playing cards in a French cafe.

[What did it look like inside a mule room? See here and here.]