„From the moment when the workers of our country and of Russia began to struggle bravely against the Czarist Government and the capitalist exploiters, we notice more and more often that the priests, in their sermons, come out against the workers who are struggling. It is with extraordinary vigour that the clergy fight against the socialists and try by all means to belittle them in the eyes of the workers. The believers who go to church on Sundays and festivals are compelled, more and more often, to listen to a violent political speech, a real indictment of Socialism, instead of hearing a sermon and obtaining religious consolation there. Instead of comforting the people, who are full of cares and wearied by their hard lives, who go to church with faith in Christianity, the priests fulminate against the workers who are on strike, and against the opponents of the government; further, they exhort them to bear poverty and oppression with humility and patience. They turn the church and the pulpit into a place of political propaganda.“

— Rosa Luxemburg

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„We go to battle against the plutocratic and reactionary democracies of the west… This gigantic struggle is nothing other than a phase in the logical development of our revolution; it is the struggle of peoples that are poor but rich in workers against the exploiters who hold on ferociously to the monopoly off all the riches and all the gold of the earth…“
— Benito Mussolini
„When the workers of a single factory or of a single branch of industry engage in struggle against their employer or employers, is this class struggle? No, this is only a weak embryo of it. The struggle of the workers becomes a class struggle only when all the foremost representatives of the entire working class of the whole country are conscious of themselves as a single working class and launch a struggle that is directed, not against individual employers, but against the entire class of capitalists and against the government that supports that class. Only when the individual worker realizes that he is a member of the entire working class, only when he recognises the fact that his petty day-to-day struggle against individual employers and individual government officials is a struggle against the entire bourgeoisie and the entire government, does his struggle become a class struggle.“
— Vladimir Lenin
„The bourgeoisie incites the workers of one nation against those of another in the endeavor to keep them disunited. Class-conscious workers, realising that the break-down of all the national barriers by capitalism is inevitable and progressive, are trying to help to enlighten and organise their fellow-workers from the backward countries.“
— Vladimir Lenin
„When the Soviet government is experiencing a difficult period and plots are being hatched by bourgeois elements and when at a critical moment we manage to lay bare these plots — do they think they are discovered accidentally? Oh, no, not accidentally. They are discovered because the plotters live among the masses, because they cannot succeed in their plots without the workers and peasants and it is there that, in the long run, they run up against people who go to that badly organised, as they said here, Cheka and say that exploiters are gathered in a certain place.“
— Vladimir Lenin
„In case of actual danger, the social democracy banks not on the "Iron Front" but on the Prussian police. It is reckoning without its host! The fact that the police was originally recruited in large numbers from among social-democratic workers is absolutely meaningless. Consciousness is determined by environment even in this instance. The worker who becomes a policeman in the service of the capitalist state, is a bourgeois cop, not a worker. Of late years, these policemen have had to do much more fighting with revolutionary workers than with Nazi students. Such training does not fail to leave its effects. And above all: every policeman knows that though governments may change, the police remains.“
— Leon Trotsky