A proletarian revolution is a social revolution in which the working class attempts to overthrow the bourgeoisie. Proletarian revolutions are generally advocated by socialists, communists and most anarchists. Marxists believe proletarian revolutions can and will likely happen in all capitalist countries, related to the concept of world revolution. The Leninist branch of Marxism argues that a proletarian revolution must be led by a vanguard of "professional revolutionaries", men and women who are fully dedicated to the communist cause and who form the nucleus of the communist revolutionary movement. This vanguard is meant to provide leadership and organization to the working class before and during the revolution, which aims to prevent the government from successfully ending it. Other Marxists such as Luxemburgists disagree with the Leninist idea of a vanguard and insist that the entire working class—or at least a large part of it—must be deeply involved and equally committed to the socialist or communist cause in order for a proletarian revolution to be successful. To this end, they seek to buildmass working class movements with a very large membership. Finally, there are socialist anarchists and libertarian socialists. Their view is that the revolution must be a bottom-up social revolution which seeks to transform all aspects of society and the individuals which make up the society. Alexander Berkman said "there are revolutions and revolutions. Some revolutions change only the governmental form by putting a new set of rulers in place of the old. These are political revolutions, and as such they often meet with little resistance. But a revolution that aims to abolish the entire system of wage slavery must also do away with the power of one class to oppress another. That is, it is not any more a mere change of rulers, of government, not a political revolution, but one that seeks to alter the whole character of society. That would be a social revolution".
