'Revolution' is not the work of a casual student but the essence of over forty years of study and of several years of association with socialist and communist groups. It is a survey of the conditions which breed profound social disturbances and give force, impetus and opportunity to those who are determined to carry through abrupt and comprehensive transformations in political or economic institutions. One chapter is devoted to the technique of revolutionary leaders who have been successful in effecting fundamental changes in the structure of nations. Lastly of all the reader will find here a hasty tracing of the cycles of revolution and a commentary upon the class formations produced in the course of their rotation. (Preface, first paragraph.)
As this book was completed before the Germans entered Poland in September, 1939, the author had in mind when using “pre-war,” “the Great War,” “the World War,” etc., the conflict which began in 1914. (Footnote, p. 3.)