Throughout the first half of the twentieth century, 32 states passed laws allowing involuntary sterilization on those deemed biologically "unfit" convicted criminals, the disabled, the poor, and people of color. Texas, despite a history of violent racism, was not one of them. In The Purifying Knife, Michael Phillips and Betsy Friauf explore this curious instance of the Lone Star State's exceptionalism. The first history of the eugenics...