Nazis, Communists, Klansmen, and Others on the Fringe: Political Extremism in America is a 1992 book by John George and Laird Wilcox.

In 1996, Prometheus Books (Amherst, New York) republished it as American Extremists: Militias, Supremacists, Klansmen, Communists and Others in a 443-page paperback (ISBN 1-57392-058-4).

Recognizing their fallibility, and inability to claim "anything approaching complete objectivity", the authors attempted to "make an honest and diligent attempt to be fair and even-handed in our treatment of this subject."

Distinguishing this book from the many covering "extremism" or "extremists" on the market (with their own agenda "to provide a rationale for persecuting or doing away with certain 'extremists'"), the authors' goal was "to provide understanding of a human problem, not a basis for one more round of persecutions."

The authors propose a definition of "extremism" based on "the behavioral model" ("defined in terms of certain behaviors, particularly behavior toward other human beings"), passing up the "normative or "statistical" way" (framing the spectrum on a linear scale, a "bell curve") and the "popularity contest" theory ("social definition agreed upon by collective fiat").