Pre-agreements prevent companies from hiring employees who are not members of the union in the agreement. Post-entry agreements require all employees recruited by the company concerned to join a specific trade union within a specified period of time as soon as they have been recruited. Closed shop agreements are provided for in Section 26 of the Employment Relations Act (LRA) and are perhaps one of the most sensitive provisions of the ARS and the most controversial with regard to the constitutionality of such agreements. A two-thirds majority of existing union members to support the deal agreement is needed. The European Court of Human Rights held that Article 11 of the European Convention on Human Rights provided for a “negative right of association or, in other words, a right not to be compelled to join an association”, in Sørensen and Rasmussen against Denmark (2006). Therefore, the closed businesses referred to in Article 11 of the Convention are illegal. The U.S. administration does not allow the union shop within a federal agency, whether or not state law permits it. A contract of employment concluded is a kind of collective agreement concluded by the Taft-Hartley Act, which also prohibits unions from charging excessively high introductory fees as a precondition to membership, in order to prevent unions from using introductory fees as a means of removing non-union employees from a given sector. In addition, the National Labor Relations Act allows employers to enter into pre-employment agreements in which they agree to source from a group of employees seconded by the union. The NLRA prohibits pre-lease agreements outside the construction industry.  Closed Shop, in union-management relations, an agreement by which an employer agrees to hire and retain only union members with a good reputation. Such an agreement is concluded under the terms of an employment contract.
A closed shop agreement is found under the terms of an employment contract. Here you will find that in order to remain employed by the related company, you must be a respected member of the specific union that is bound by contract. .