Tensile strength is defined as a stress, which is measured as force per unit area. For some non-homogeneous materials (or for assembled components) it can be reported just as a force or as a force per unit width.
Answer Wiki. The practice of organizing to aggregate individuals' influence for economic reasons probably began with European craft guilds, although the master craftsmen were actually employers and capitalists. Trade unions or labor unions originated in England in the 1700s, but were outlawed until the 1800s.
The Industrial Workers of the World, or IWW, was founded in 1905 in Chicago, and by 1908 had become influential among migrant laborers in the Pacific Northwest. Members were dubbed Wobblies and soon earned a reputation for loud singing, radicalism, and militancy.