28 A new branch of law, wholly unknown to the earlier time, has arisen from this continuous and unwearied labor to protect vigorously the sacred rights of the workers that flow from their dignity as men and as Christians. These laws undertake the protection of life, health, strength, family, homes, workshops, wages and labor hazards, in fine, everything which pertains to the condition of wage workers, with special concern for women and children. Even though these laws do not conform exactly everywhere and in all respects to Leo's recommendations, still it is undeniable that much in them savors of the Encyclical, On the Condition of Workers , to which great credit must be given for whatever improvement has been achieved in the workers' condition.
Source: Quadragesimo Anno (Vatican.va)