A French writer, sympathetic to anarchism, wrote in the 1890s that "anarchism has a broad back, like paper it endures anything"---including, he noted those whose acts are such that "a mortal enemy of anarchism could not have done better." There have been many styles of thought and action that have been referred to as "anarchist." It would be hopeless to try to encompass all of these conflicting tendencies in some general theory or ideology. And even if we proceed to extract from the history of libertarian thought a living, evolving tradition, as Daniel Guérin does in Anarchism, it remains difficult to formulate its doctrines as a specific and determinate theory of society and social change. The anarchist historian Rudolph Rocker, who presents a systematic conception of the development of anarchist thought towards anarchosyndicalism, along lines that bear comparison to Guérins work, puts the matter well when he writes that anarchism is not a fixed, self-enc...