Rubenstein (1987) suggests that terrorism usually springs from the political alienation of the INTELLIGENTSIA from both the ruling class and the masses. The former engages in repression and the latter is indifferent. This combination is particularly likely to appear in colonial situations although it may occur in any country where a social crisis generated by rapid and uneven economic development isolates intellectuals from the masses for whom they wish to act as political spokesman. The other precondition for terrorism occurs when a reform movement collapses or when it appears that such movement will not succeed in restructuring society. For advocates of terrorism, individual or small-group violence becomes the only means that can expose the fragility of the ruling class, raise the consciousness of the masses, and attract new members and supporters to the movement. Rubenstein shares the Marxist view that terrorists have rarely gained mass working-class support and have usually been ineffective in making social revolutions. As an instrument of political change, however, terrorism has often been effective, e.g. as an adjunct of nationalist movements.