Enemy Within: If the Kansas City Plant was not a "dirty" site, then why were its workers getting sick and dying prematurely? Government summaries of the manufacturing history reveal the Kansas City Plant worked with an array of radioactive materials over several decades. "The problem is the [plant] workers were not told, and they were not adequately protected," said David M. Manuta, a consultant with expertise in chemical industrial processes and radioactive material. "Kansas City was considered non-nuclear. And yet we know otherwise."