Reviewed by: Cooperation with Evil: Thomistic Tools of Analysis by Kevin L. Flannery, S.J Gregory M. Reichberg Cooperation with Evil: Thomistic Tools of Analysis. By Kevin L. Flannery, S.J. Washington, D.C.: The Catholic University of America Press, 2019. Pp. 279. $34.95 (paper). ISBN 978-0-8132-3244-7. Our world is increasingly interconnected. People in disparate regions across the globe are working together in unprecedented ways. The power to accomplish great things emerges from our human collaboration ("if two of you agree on earth about anything you request, it will be done for you by my Father in heaven" [Matt 18:19]); but as we know from the tragic lessons of history, when people collaborate for wrongful ends the impact of evil is proportionately magnified. Collaboration in evil is conceptually most unproblematic when several people join in a project of deliberate wrongdoing, as when an organized band of criminals conspire to rob a bank. But most such efforts also depend on other individuals who, not directly part of the criminal purpose, nonetheless contribute tacit support to the initiative, if only out of fear—say, a bank employee who, having been blackmailed, hands over the combination of a bank's safe. Still others are unwittingly caught up in the crime's wake; for instance, a taxi driver who is asked to drive men to a bank and is told to wait for their return, only finding out afterwards they were there to conduct a robbery. Unlike the fellow conspirators who are clearly guilty, it is much harder to parse the responsibility of the other actors mentioned; intuitively we think the bank teller bears some attenuated guilt, and the taxi driver none. The Catholic tradition has long sought to explain these different contributions to wrongdoing by appeal to the distinction, made famous by Alphonsus de Liguori, between formal and material cooperation in evil. In broadest terms, the former designates a contribution that (in one way or another) is culpable, and the latter a contribution that is blameless. How to parse the difference is where the rubber hits the road; here as elsewhere the devil is in the details. The analytical challenge has become progressively greater as human beings find themselves in ever larger and multiple groupings, such as the employees in an international conglomerate with its multiple subsidiaries, or the citizens of a large bureaucratic state. The Latin cooperatio ad malum (literally "cooperation toward evil"—nicely rendered in French by "la cooperation au mal") is ordinarily translated into [End Page 329] English using the prepositions "in" or "with." While the latter is used in the present volume, I prefer the former, because the issue is about cooperating with others in deeds that are evil, not partnering with evil as when Faust made a pact with the devil in Goethe's famous play. Moreover, in Scholastic moral theory, malum designates sins of potentially different degrees of gravity, not only those that are grandiosely sinister. "Cooperation in wrongdoing" would accordingly be the most suitable translation of the Latin phrase under discussion. Is the "Catholic" distinction between formal and material wrongdoing adequate to the task of differentiating culpable from nonculpable contributions to wrongdoing? Answering this question is, fundamentally, the agenda that Kevin Flannery sets for himself in this book. To simplify the gist of a complex narrative, the answer he provides is basically "no." His argument is chiefly textual and historical. By tracing the origination of the distinction and its opposing interpretations, he seeks to show how the binary formal/material cannot provide a silver bullet for determining whose contribution to wrongdoing is culpable, and whose is not. For the principles that can guide discernment of the most relevant categories and their application to concrete cases, he urges us to consult Thomas Aquinas. In offering this Thomistic analysis of cooperation in evil and showing why it is superior to the approach later formulated by Alphonsus and his successors, Flannery has succeeded well at his task. As suggested by its subtitle, the book also aims to provide tools for sorting out the complex issues of collaboration we confront today. In other words, the author presents his project as of interest...