Amid the clashes, complexities, and political personalities of world politics in the late nineteenth and early twentieth centuries, Peter Kropotkin stands out. Born a prince in Tsarist Russia and sent to Siberia to learn his militaristic, aristocratic trade, he instead renounced his titles and took up the "beautiful idea" of anarchism. Across a continent he would become known as a passionate advocate of a world without borders, without kings and...