December 6

African-American delegates meet in Washington, D.C., to form the Colored National Labor Union as a branch of the all-White National Labor Union created three years earlier. Unlike the NLU, the CNLU welcomed members of all races. Isaac Myers was the CNLU's founding president; Frederick Douglass became president in 1872 - 1869
 
The Washington Monument is completed in Washington, D.C. On the interior of the monument are 193 commemorative stones, donated by numerous governments and organizations from all over the world; one of them is from the Int’l Typographical Union, founded in 1852.  In 1986 the ITU merged into the Communications Workers of America - 1884
 
A total of 361 coal miners die at Monongah, W.Va., in nation's worst mining disaster - 1907
 
Int’l Glove Workers Union of America merges into Amalgamated Clothing Workers - 1961
 
United Mine Workers begin what is to become a 110-day national coal strike - 1997