The National Spiritualist Association of Churches (NSAC) is one of the oldest and largest of the national Spiritualist church organizations in the United States. The NSAC was formed as the National Spiritualist Association of the United States of America (NSA) in September 1893, during a three-day convention in Chicago, Illinois. Although American Spiritualists had previously tended to resist institutional or denominational organization, early NSA leaders hoped organization would help promote the truths of the religion both spiritually and practically. Organization could help non-Spiritualists distinguish genuine mediumship from the rapidly proliferating varieties of fraudulent mediumship, increase communication among Spiritualists, prevent the legal prosecution of spirit mediums under for