January 15

Martin Luther King, Jr. born - 1929
And this:

January 15, 1929 - Birthdate of the Rev. Dr. Martin Luther King, Jr. In addition to his contribution to the civil rights movement of the 1950s and 1960s, King was an earnest crusader for labor, particularly municipal and hospital workers. Quote from King: "We look around every day and we see thousands and millions of people making inadequate wages. Not only do they work in our hospitals, they work in our hotels, they work in our laundries, they work in domestic service, they find themselves unemployed. You see, no labor is really menial unless you're not getting adequate wages."
The Pentagon, to this day the largest office building in the world, is dedicated just 16 months after groundbreaking. At times of peak employment 13,000 workers labored on the project - 1943
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_01_15_2011