 The "Spectrum" editors have said, "Every ten years or so another witch hunt occurs" in Adventist higher education.Adventist historian Michael W. Campbell observes that Adventist "history teachers and the use of historical method became especially suspect as Adventism became more Fundamentalist during the 1920s," during which time its history teachers were "on the front line of those who were pushed out of the church".According to Terrie Dopp Aamodt, one of the first major "purges" was at Walla Walla College in 1938.