Although it is challenging to study the modern anarchist movement, given its aversion to surveillance and external documentation, there is enough evidence available to draw preliminary conclusions about this global movement, and some of its characteristics, including ideology, organizations, and aspirational motivations. Scholars have built theories to explain the existence and behavior of social movements-yet almost none of this work has focused on anarchist movements, which have unique qualities very different from other mainstream movements. Likewise, anarchists and other social...