"The Blood and Sweat Behind Labor Day" (CNN.com)

"To most Americans, the first Monday in September means a three-day weekend and the last hurrah of summer, a final outing at the shore before school begins, a family picnic.

But Labor Day was born in a time when work was no picnic. As America was moving from farms to factories in the Industrial Age, there was a long, violent, often-deadly struggle for fundamental workers' rights, a struggle that in many ways was America's "other civil war."

Read more about the history of Labor Day at CNN.com