The sticker is an old print that ran in a New York City newspaper showing a crowd, in that city, on Labor Day in 1882 .. Labor Day in the United States is a holiday celebrated on the first monday in september .. it's a celebration of the american labor movement and is dedicated to the social and economic achievements of workers .. it constitutes a yearly national tribute to the contributions workers have made to the strength, prosperity, and well-being of their country .. labor day was promoted by the central labor union and the knights of labor, who organized the first parade in New York City .. after the Haymarket Massacre (which occurred in Chicago on May 4, 1886 and is generally considered significant as the origin of international May Day observances for workers) .. the U.S. president at that time, Grover Cleveland, feared that commemorating labor day on May 1 could become an opportunity to commemorate that bloody affair. so in 1887, it was established as an official holiday in september to support the labor day that the knights of labor favored .. in Canada, the equivalent holiday is Labour Day, and is also celebrated on the first monday of september .. in many other countries around the world, Labour Day is synonymous with, or linked with, International Workers' Day, which occurs on the 1st of may .. however you spell it, it's a day to honor all the hard working people of the world..