A number of modern historians have reminded us that the history of the West has been the history of revolution. And these revolutions have occurred not merely as the result of an objective crisis in society, but because a crisis was precipitated by the emergence and action of a new dynamic proletariat. In each case, this proletariat had been captured by a new vision of a new social order. Its members found themselves excluded from the benefits of the status quo, or repelled by its injustices. Eventually they reached a point where their consuming passion was to bring the old order down and build a new and they were willing to sacrifice their lives so that this could happen.

These movements became disruptive forces in their societies; in some instances, they overthrow the old order and, eventually, organized society on a new foundation, with new structures of economic, social and political life. They often failed to achieve their goals, yet when we look back on our history today, we can see that many of the most significant breakthroughs toward a more human society have occurred as a result of these revolutions.

It is hard to avoid the conclusion that the emergence of such revolutionary forces is once again the order of the day. In the United States, this new proletariat has made its appearance among the black militants and the radicals of a new student generation. But it is in the Third World, and especially in Latin America, that this phenomenon is most widespread.