Workers of the World, Unite!

On September 1, 1882, the Carpenters and Joiners Union of New York City held the first Labor Day celebration. On September 1, 1894, Congress declared Labor Day a national holiday. (Facts from a nifty site call Reference.com, that publishes This Day in History via email or RSS.)

More about Labor Day... The History of Labor Day from the Department of Labor

And because it is that time of year, Back to School facts from the Census Bureau...