What is the difference between an exclusive union and an inclusive union?

An exclusive union is one in which a union first gets employers to agree to hire only union workers and then excludes many workers from joining the union in order to restrict the supply of labor and drive up wages. This is true of craft unions, whose members possess a particular skill like carpenters, masons, and plumbers. It also applies to many professional organizations such as the American Medical Association, National Education Association, and the American Bar Association.An inclusive union is one in which a union attempts to include every worker in a given industry in order to be able to restrict the entire industry's labor supply and thereby raise wages.