"Ravished by Some Moron": The Eugenic Origins of the Minnesota Psychopathic Personality Act of 1939

Twenty U.S. states permit the indefinite detention of civilly committed sex offenders after the end of their prison sentences if their dangerousness is due to a "mental abnormality." This article explores the origins of one such law by examining its predecessor, the Minnesota Psychopathic Personality Act of 1939. Passed in the wake of a panic over sex crimes and upheld by the Supreme Court in 1940, Minnesota's psychopath statute extended a 1917 eugenics law providing for the compulsory civil commitment and institutionalization of "defectives" to persons alleged to have a psychopathic personality. Analyzing the 1917 and 1939 laws together shows how one state's psychopath statute had less to do with psychiatric authority than with the legal and administrative framework established by Progressive-era eugenics. From the 1910s until today, dubious claims about the ability of science to identify potential criminals legitimized politically popular, but constitutionally questionable, forms of administrative and social control.