In her article about control units for women, Cassandra Shaylor states that the U.S. Court of Appeals ruled that prisons are free to use political associations and beliefs to justify different and harsher treatment. (An earlier, unnamed and undated court decision determined that the placement of female political prisoners at the Lexington Federal Prison in Kentucky was unconstitutional because women were housed there because of their political beliefs. The court ordered them transferred and the unit shut down)

Where would I find the name and date (and text, if possible, or more information if not) of this U.S. Court of Appeals decision?