(1) A trade union shall not conduct industrial actions, without a decision made by concurrent votes of a majority of the union members (where the bargaining representative trade union is decided pursuant to Article 29-2, the entire trade union members that participated in the procedures) by a direct, secret, and unsigned ballot. In such cases, the number of trade union members shall be calculated on the basis of trade union members who are employed workers. <Amended on Jan. 5, 2021>
(2) From among workers engaged in a major business of the national defense industry designated by the Defense Acquisition Program Act, those who are involved in production of electricity, water, or a work of mainly producing national defense goods shall not conduct industrial actions, and the scope of those who are involved in a work of mainly producing national defense goods shall be prescribed by Presidential Decree. <Amended on Jan. 2, 2006>