Extreme right-wing groups have always been a part of the American religious and political landscape. The era between the world wars, especially the 1930s, was a particularly volatile period, and by 1940, racist, nativist, and fascist groups had become so visible as to arouse public fears of insurrection and sabotage. In Hoods and Shirts, Philip Jenkins uses developments in Pennsylvania as a case study of the local activities and broader significance...