Furfey pursued an intellectual apostolate according to which he advanced social justice in theory and practice through his scholarship and correspondence. In the mid-1930’s Furfey concentrated on developing and articulating a specifically Catholic response to social problems. He revised his objective, concentrating on developing a Catholic technique and corresponding foundational Catholic motivation to address social problems. Furfey advanced and defended his position in print, writing several books and many articles on the topic, and through voluminous correspondence with leading Catholic intellectuals in the United States. Il Poverello House and Fides House represented his and his colleagues’ attempt to develop a social reform technique that was both thoroughly Catholic and rigorously scientific. He received support and cooperation from his colleagues at CUA and in the broader Catholic community. A rift emerged at his home institution. Mary Elizabeth Walsh most prominently supported and advanced supernatural sociology while Gladys Sellew wavered, expressing distress and dissatisfaction with respect to the meaning and application of supernatural sociology. The chapter also considers the challenges to Furfey’s theological society levelled by Raymond McGowan, Wilfred Parsons, and John Courtney Murray.