the closed shop form of union security means that the
Closed shop A pre-entry closed shop (or simply closed shop) is a form of union security agreement under which the employer agrees to hire union members only, and employees must remain members of the union at all times in order to remain employed. This is different from a post-entry closed shop (US: union shop), which is an agreement requiring all employees to join the union if they are not already members.[1] In a union shop, the union must accept as a member any person hired by the employer.[2]
Right-to-work law According to the Legal Defense Foundation, right-to-work laws prohibit union security agreements, or agreements between employers and labor unions, that govern the extent to which an established union can require employees' membership, payment of union dues, or fees as a condition of employment, either before or after hiring. Right-to-work laws do not aim to provide general guarantee of employment to people seeking work, but rather are a government ban on contractual agreements between employers and union employees requiring workers to pay for the costs of union representation.[2]