Pope John XXIII
Mater et Magistra §92
The Participation of Workers in Specific Enterprises
92 This demands that the relations between management and employees reflect understanding, appreciation and good will on both sides. It demands, too, that all parties co-operate actively and loyally in the common enterprise, not so much for what they can get out of it for themselves, but as discharging a duty and rendering a service to their fellow men.
Source: Mater et Magistra (Vatican.va)