During the 20th Century, thirty-two state legislatures passed laws that sanctioned coercive sexual sterilization as a solution to the purported detrimental increases in the population of “unfit” or “defective” citizens. While both scholarly and popular commentary has attempted to attribute these laws to political parties, or to broad or poorly defined ideological groups such as “progressives,” no one has identified the political allegiance of each legislator who introduced a successfully adopted sterilization law, and the governor who signed it. This article remedies that omission.