All Sides with Amy Juravich Tracing Halloween Back to Spiritualist Movements ÐÇ¿ÕÎÞÏÞ´«Ã½ 89.7 NPR News | By admin Published October 28, 2010 at 10:00 AM EDT Email Listen • 0:00 Mitch Horowitz, author of , a book about mystical and spiritualist movements that helped to shape our nation.