Mahony's correspondence,1900s-1958, in his capacity as a businessman, and advocate for improving the labor and living conditions of Mexican migrant workers, primarily concerning Mahony's efforts to spread information on migrant economic and social conditions to various groups that might aid his cause. Correspondents include Oswald Garrison Villiard, editor of The Nation; George Shuster, editor of Commonweal; Wilfred Parsons SJ, editor of America; Bishop John Francis Noll, publisher of Our Sunday Visitor, and Fr. Francis J. Hass, Director of the Catholic School of Social Work.