103 We must also express here Our heartfelt appreciation of the work that is being done by the International Labor Organization—popularly known in various countries as the O.I.L. or I.L.O. Or O.I.T. For many years now it has been making an effective and valued contribution to the establishment in the world of an economics and social order marked by justice and humanity, an order which recognizes and safeguards the lawful rights of the workingman.
Source: Mater et Magistra (Vatican.va)