Pope Leo XIII also defended the worker's natural right to enter into association with his fellows. Such associations may consist either of workers alone or of workers and employers, and should be structured in a way best calculated to safeguard the workers' legitimate professional interest. And it is the natural right of the workers to work without hindrance, freely, and on their own initiative within these associations for the achievement of these ends.
Finally, both workers and employers should regulate their mutual relations in accordance with the principle of human solidarity and Christian brotherhood. Unrestricted competition in the liberal sense, and the Marxist creed of class warfare; are clearly contrary to Christian teaching and the nature of man.
These, Venerable Brethren, are the basic principles upon which a genuine social and economic order must be built.
The response of good Catholics to this appeal and the enterprise they showed in reducing these principles into practice is hardly surprising. But others too, men of good will from every nation in the world, were impelled, under pressure of human necessity, to pursue the same course.