By the early years of the twentieth century, the two major socialist parties in Russia, the Social Democrats and the Socialist-Revolutionaries, had taken shape. But these two parties did not win the adherence of all of Russia's revolutionary activists. There existed in addition a series of small extremist groups that formed what might be called the “militant fringe” of the revolutionary movement. These groups differed among themselves on programs, methods and ultimate objectives, but they all rejected the leading parties as insufficiently committed to revolution or too slow-moving in their tactics to achieve it. Although they never attained the numerical or organizational strength of the SD's and SR's, they remained a significant element in the revolutionary movement and left their mark on Russia's political life. The three main components of the militant fringe were the anarchists, the SR Maximalists, and the Makhaevists. Of these the Makhaevists are almost unknown today, although they formed organizations in several cities and rivalled the Maximalists and anarchists for the allegiance of the revolutionary extremists. An account of their program and activities will help to shed light on a segment of the Russian political spectrum whose insight into Russia's social and political condition has been underestimated, and on the revolutionary role of its smallest but in many ways most original element.