December 26
December 26, 1862 - The largest public mass execution ever in the United States took place in Mankato, Minnesota, when the U.S. military hung 38 Dakota men for their part in the "Sioux Outbreak" that began in August of that year. Every year, Native Americans commemorate the tragedy with a memorial run from Fort Snelling to Mankato, followed by a pipe ceremony to honor their ancestors.
Knights of Labor founded. Constitution bars from membership “parasites,” including stockbrokers and lawyers - 1869

Workingmen’s Party is reorganized as the Socialist Labor Party - 1877
December 26, 1917 - The Meatcutters, Sausage Makers and Butcher Workmen of Minneapolis, Local No. 653, received its charter.
Labor history is found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_12_26_2010http://today.excite.com/history.html1917 During World War I, the U.S. government took over operation of the nation's railroads.
2000 Michael McDermott, age 42, opened fire at his place of employment killing seven people. McDermott had no criminal history.