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 will inevitably happen in all capitalist countries, related to the concept of world revolution.
A communist revolution is a proletarian revolution, often but not necessarily inspired by the ideas of Marxism, that aims to replace capitalism with communism, typically with socialism as an intermediate stage. The idea that a proletarian revolution is needed is a cornerstone of Marxism; Marxists believe that the workers of the world must unite and free themselves from capitalist oppression to create a world run by and for the working class. Thus, in the Marxist view, proletarian revolutions need to happen in countries all over the world.
- The anarchists put the thing upside down. They declare that the proletarian revolution must begin by doing away with the political organisation of the state. But after its victory the sole organisation which the proletariat finds already in existence is precisely the state. This state may require very considerable alterations before it can fulfil its new functions. But to destroy it at such a moment would be to destroy the only organism by means of which the victorious proletariat can assert its newly-conquered power, hold down its capitalist adversaries and carry out that economic revolution of society without which the whole victory must end in a new defeat and in a mass slaughter of the workers similar to those after the Paris Commune.
- Friedrich Engels, Letter to Philipp Van Patten (18 April 1883)
- Big industry has brought all the people of the Earth into contact with each other, has merged all local markets into one world market, has spread civilization and progress everywhere and has thus ensured that whatever happens in civilized countries will have repercussions in all other countries. It follows that if the workers in England or France now liberate themselves, this must set off revolution in all other countries – revolutions which, sooner or later, must accomplish the liberation of their respective working class.
- Everywhere the proletariat develops in step with the bourgeoisie. In proportion, as the bourgeoisie grows in wealth, the proletariat grows in numbers. For, since the proletarians can be employed only by capital, and since capital extends only through employing labor, it follows that the growth of the proletariat proceeds at precisely the same pace as the growth of capital. Simultaneously, this process draws members of the bourgeoisie and proletarians together into the great cities where industry can be carried on most profitably, and by thus throwing great masses in one spot it gives to the proletarians a consciousness of their own strength. Moreover, the further this process advances, the more new labor-saving machines are invented, the greater is the pressure exercised by big industry on wages, which, as we have seen, sink to their minimum and therewith render the condition of the proletariat increasingly unbearable. The growing dissatisfaction of the proletariat thus joins with its rising power to prepare a proletarian social revolution.
- The abolition of private property is, doubtless, the shortest and most significant way to characterize the revolution in the whole social order which has been made necessary by the development of industry – and for this reason it is rightly advanced by communists as their main demand.
- In all probability, the proletarian revolution will transform existing society gradually and will be able to abolish private property only when the means of production are available in sufficient quantity. What will be the course of this revolution? Above all, it will establish a democratic constitution, and through this, the direct or indirect dominance of the proletariat.
- By creating the world market, big industry has already brought all the peoples of the Earth, and especially the civilized peoples, into such close relation with one another that none is independent of what happens to the others. Further, it has co-ordinated the social development of the civilized countries to such an extent that, in all of them, bourgeoisie and proletariat have become the decisive classes, and the struggle between them the great struggle of the day. It follows that the communist revolution will not merely be a national phenomenon but must take place simultaneously in all civilized countries. ... It is a universal revolution and will, accordingly, have a universal range.
- We don’t think you fight fire with fire best ; we think you fight fire with water best. We’re going to fight racism not with racism, but we’re going to fight with solidarity. We say we’re not going to fight capitalism with black capitalism, but we’re going to fight it with socialism. We’re stood up and said we’re not going to fight reactionary pigs and reactionary state’s attorneys like this and reactionary state’s attorneys like Hanrahan with any other reactions on our part. We’re going to fight their reactions with all of us people getting together and having an international proletarian revolution.
- Fred Hampton, excerpt from Fred Hampton - "Political Prisoner" video.
- The proletarian revolution is impossible without the sympathy and support of the overwhelming majority of the working people.
- Vladimir Lenin, Collected Works, Vol. 30, pp. 52–62.
- The Communist revolution is the most radical rupture with traditional property relations; no wonder that its development involves the most radical rupture with traditional ideas.
- Karl Marx and Friedrich Engels The Communist Manifesto (1848), Section 2, paragraph 64. 
- The Communists disdain to conceal their views and aims. They openly declare that their ends can be attained only by the forcible overthrow of all existing social conditions. Let the ruling classes tremble at a Communistic revolution. The proletarians have nothing to lose but their chains. They have a world to win.
WORKING MEN OF ALL COUNTRIES, UNITE!
- Karl Marx and Friedrich Engels The Communist Manifesto (1848), Section 4, paragraph 11 (last paragraph) 
- Variant translation: Workers of the world, unite!
- If I believed that force would ever build a better world, I would be a Marxist revolutionary. But I have no more faith in poor men's animalism than in rich men's. And I want no proletarian revolution until the proletariat has demonstrated devotion to reason which the rich, with larger opportunities to cultivate that virtue, have so universally failed to achieve. I favor the underdog against the upperdog, but I favor something better than a dog above both of them.
- Milton S. Mayer, "I Think I'll Sit This One Out" in Saturday Evening Post (7 October 1939); republished in We Who Dared to Say No to War: American Antiwar Writing from 1812 to Now ( 2008), edited by Murray Polner and Thomas E. Woods, p. 193
- Proletarians of all countries, we do not say that in Germany all the power has really been lodged in the hands of the working people, that the complete triumph of the proletarian revolution has already been attained. There still sit in government all those socialists who in August 1914 abandoned our most precious possession, the International, who for four years betrayed the German working class and at the same time the International. But, proletarians of all countries, now the German proletarians are speaking to you. We believe we have the right to appeal before your forum in their name. From the first day of this war we endeavored to do our international duty by fighting that criminal government with all our power, and by branding it as the one really guilty of the war. Now, at this moment, we are justified before history, before the International, and before the German proletariat. The masses agree with us enthusiastically; constantly widening circles of the proletariat share the knowledge that the hour has struck for a settlement with capitalist class rule.
- Spartacus Manifesto, 26 November 1918