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]
Strike action Another counter to a strike is a lockout, the form of work stoppage in which an employer refuses to allow employees to work. Two of the three employers involved in the Caravan park grocery workers strike of 2003-2004 locked out their employees in response to a strike against the third member of the employer bargaining group. Lockouts are, with certain exceptions, lawful under United States labor law.