March 28
March 28, 1919 - Six hundred courthouse employees in Minneapolis attended an organizational meeting of the Municipal Employees Union to discuss the benefits of unionization.
Members of Gas House Workers’ Union Local 18799 begin what is to become a four-month recognition strike against the Laclede Gas Light Co. in St. Louis. The union later said the strike was the first ever against a public utility in the U.S. - 1935
Martin Luther King, Jr., leads a march of striking sanitation workers in Memphis, Tenn. Violence during the march persuades him to return the following week to Memphis, where he was assassinated - 1968
And this:

March 28, 1968 - The Rev. Dr. Martin Luther King, Jr., led a march by striking sanitation workers in Memphis, Tennessee. They carried signs stating, “I am a man.” Violence at the march persuaded King to return to Memphis the following week. On April 4, 1968, after speaking to the strikers, he was assassinated. For more on Dr. King and the Memphis strike, visit the AFSCME website,
http://www.afscme.org/about/1029.cfmLabor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_03_28_2011