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.
Best Answer: The first US labor union was the Federal Society of Journeymen Cordwainers (shoemakers), formed in Philadelphia, Pennsylvania, in 1794. The first national labor organisation was the Federation of Trades and Labor Unions founded in 1881. Source(s):