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 Federation of Organized Trades and Labor Unions was formed in 1881, and the American Federation of Labor (AFL) was founded five years later.rigin of Labor Unions The first hundred years of U.S. history saw relatively little in the development of labor unions. A few were organized in scattered fashion, but many of those simply disbanded after they had achieved their goals, such as when the printers briefly unionized in New York City in 1778.