Well known and respected for their popular investigations of the source of worry on the left, the Overstreets have not become ambidextrous. It is the rray of menacing organizations on the extreme right which they are scrutinizing ere; but one of their main points is in the great number of striking similiar, in structure, tactics ad even goals, to be found at the two ends of the political spectrum. The approach is representative rather than inclusive: the rst third of the book is devoted to the John Birch Society; part two consists of chapters on the Dan Smoot Report, Carl McIntire, Myers G. Lowman's Circuit ders; Edgar C. Bundy, and Billy James Hargis' Christian Crusade; while the final section attempts to ""interpret the practical consequences"" of such phenomena. Of especial interest is a chapter on the ""four targets that are given respite from attack"" by the radical rightists; public schools and libraries, A's, and the mental health movement. The conclusion calls for ""local ingenty"" to ""strengthen the liberal-conservative--or conservative-liberal--center"" our society. In sum, this is as measured, through, and authoritative a study of a currently important subject as one would expect from the authors of The Mature Mind and What We Must Know About Communism.