In the wake of the 1927 landmark Supreme Court decision in the  Buck v. Bell  case, which affirmed the constitutionality of laws authorizing the compulsory sterilization of so-called “feeble-minded” residents of state institutions, moral theologian and priest John A. Ryan took up his pen to address the issue of sterilization from a Catholics perspective. In the resulting pamphlet,  Human Sterilization , Ryan argued that eugenic sterilization measures were not only unscientific and bad social policy, but that the  Buck  decision in its articulation of civil rights represented a clear departure from the understanding of natural rights in Catholic moral teaching. The production of this text was the first piece of literature published by the National Catholic Welfare Conference that attempted to mobilize Catholic citizens throughout the United States in active opposition to eugenic sterilizahon laws as they came before the state legislatures.