unionisation

/ˌjun.jən.əˈzeɪ.ʃən/
noun
  1. The process of workers organizing into a labor union or the state of being unionized.
    • The company tried to prevent unionisation by offering higher pay without a contract.
    • Unionisation of the warehouse workers led to better wages and safer working conditions.
    • Historians study the unionisation of factory workers in the early 20th century.