RNs AT SAINT LOUIS UNIVERSITY HOSPITAL VOTE BY 76% TO AFFILIATE WITH NATIONAL NURSES UNITED. ST. LOUIS – By a landslide of 76 percent, registered nurses at Saint Louis University Hospital (SLUH) Thursday night voted to join the National Nurses Organizing Committee-Missouri (NNOC-Missouri), an affiliate of the 185,000-member National Nurses United (NNU), the largest union and professional association of RNs in the U.S.