Pope Pius XI
Quadragesimo Anno §148
Quadragesimo Anno: On Reconstruction of the Social Order
148 That this may happily come to pass, to all of you, Venerable Brethren and Beloved Children, who are members of the vast Catholic family entrusted to Us, but with the especial affection of Our heart to workers and to all others engaged in manual occupations, committed to us more urgently by Divine Providence, and to Christian employers and managements, with paternal love We impart the Apostolic Benediction. Given at Rome, at Saint Peter's, the fifteenth day of May, in the year 1931, the tenth year of Our Pontificate.
Source: Quadragesimo Anno (Vatican.va)