For the purpose of the interpretation of the provisions of this chapter, the public policy of this state is declared to be that a worker of this state must be free to decline to associate with the worker’s fellow workers, but that the worker also has full freedom of association, self-organization, and designation of representatives of the worker’s own choosing to negotiate the terms and conditions of the worker’s employment, and that the worker is free in such matters, as well as in other concerted activities for the purposes of collective bargaining or other mutual aid or protection, from interference, restraint, or coercion by employers of labor or their agents.