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.
The first national labor federation to remain active for more than a few years was the Noble Order of the Knights of Labor. It was established in 1869 and had set as goals the eight-hour workday, equal pay for equal work, and the abolition of child labor.