Peter H. Merkl 
Political Violence Under the Swastika [PDF ebook] 
581 Early Nazis

Going to the active core of the Nazi revolt, this exciting psychological, sociological, and behavioral study is based on unique autobiographical stones supplied by over 500 pre-1933 rank-and-file Nazis. Peter Merkl’s findings form the basis for a richer understanding of the political motivation of all extremist movements.
Originally published in 1975.
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