April 28
Coal mine collapses at Eccles, W.Va., killing 181 workers - 1914

119 die in Benwood, W.Va. coal mine disaster - 1924
United Wallpaper Craftsmen & Workers of North America merges with Pulp, Sulfite & Paper Mill Workers - 1958
American Federation of Hosiery Workers merges with Textile Workers Union of America - 1965
Congress creates OSHA, the Occupational Safety and Health Administration. The AFL-CIO sets April 28 as “Workers Memorial Day” to honor the hundreds of thousands of workers killed and injured on the job every year - 1970.
And this:

April 28, 1970 - Congress approved legislation to create OSHA, the Occupational Safety and Health Administration. The AFL-CIO commemorates April 28 as “Workers Memorial Day” to honor the hundreds of thousands of working people killed and injured on the job every year.
For more on Workers Memorial Day, see
http://www.aflcio.org/issues/safety/memorial/First “Take Our Daughters to Work Day,” promoted by the Ms. Foundation, to boost self-esteem of girls with invitations to a parent’s workplace - 1993
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_04_28_2011