Divini Redemptoris §53

⁵³ It happens all too frequently, however, under the salary system, that individual employers are helpless to ensure justice unless, with a view to its practice, they organize institutions the object of which is to prevent competition incompatible with fair treatment for the workers. Where this is true, it is the duty of contractors and employers to support and promote such necessary organizations as normal instruments enabling them to fulfill their obligations of justice. But the laborers too must be mindful of their duty to love and deal fairly with their employers, and persuade themselves that there is no better means of safeguarding their own interests.