A semitone, also called a half step or a half tone, is the smallest musical interval commonly used in Western tonal music, and it is considered the most dissonant when sounded harmonically. It is defined as the interval between two adjacent notes in a 12-tone scale (e.g. from C to C â¯).
The National Labor Union. The first large-scale U.S. union was the National Labor Union, founded in 1866 to organize skilled and unskilled laborers, farmers, and factory workers.
1866 National Labor Union founded - an attempt at creating a national federation of unions. 1867 Knights of St. Crispin founded - a union of factory workers in the shoe industry. 1868 First federal eight-hour law passed - applied only to laborers, workmen, and mechanics employed by the. government.