The separation thesis states that business and moral decision making should and can be differentiated clearly. This study provides empirical support for the competing view that the separation thesis is impossible through a case study of the Rotary Club, which fosters an ethical orientation among its global business and professional membership. The study focuses attention on the Club in the early to middle 20th century. Based on a reading of their service doctrine, the four objects of Rotary and the Four Way Test, the author argues that the example of the Rotary Club undermines the separation thesis. The Rotary message was conceptually ambiguous: it did not clearly differentiate business roles from social activities; rather both fed into each other, with the business tools developed by members and disseminated by Rotary, utilized in nonbusiness contexts with a view to enhancing societal well-being.