Quadragesimo Anno §29

²⁹ Finally, the wise Pontiff showed that "employers and workers themselves can accomplish much in this matter, manifestly through those institutions by the help of which the poor are opportunely assisted and the two classes of society are brought closer to each other." First place among these institutions, he declares, must be assigned to associations that embrace either workers alone or workers and employers together. He goes into considerable detail in explaining and commending these associations and expounds with a truly wonderful wisdom their nature, purpose, timeliness, rights, duties, and regulations.