A national organization, which the New York State Nurses Association helped found three years ago, is now suing the state group, seeking delinquent membership dues and other payments. The National Federation of Nurses, formed in 2009 by the state nurses union and unions from five other states, filed sued last week in U.S. District Court in Albany. It seeks $609,000 in overdue membership dues, another $228,000 in withdrawal and disaffiliation charges, the equivalent of three months of dues. It also seeks unspecified additional amounts to cover attorneys' fees and other costs.