After many years I finally found the time to read Norman Cohn's The Pursuit of the Millennium: Revolutionary Millenarians and Mystical Anarchists of the Middle Ages first published in 1957. For all the attention this book has received I was quite disappointed.
Cohn's thesis rests on a cobbled together narrative that
confuses popular impulse and superstition with religious conviction. He tries
to argue that various utopian and chiliastic movements of the medieval period were
the cultural and ideological precursors of twentieth century Nazism and
Communism.