„The theory of “defeating” opportunist elements by the ideological struggle within the Party, the theory of “overcoming” these elements within the confines of a single party, is a rotten and dangerous theory, which threatens to condemn the Party to paralysis and chronic infirmity, threatens to leave the Party a prey to opportunism, threatens to leave the proletariat without a revolutionary party, threatens to deprive the proletariat of its main weapon in the fight against imperialism. Our Party could not have emerged on to the broad highway, it could not have seized power and organised the dictatorship of the proletariat, it could not have emerged victorious from the civil war, if it had had within its ranks people like Martov and Dan, Potresov and Axelrod. Our Party succeeded in achieving internal unity and unexampled cohesion of its ranks primarily because it was able to in good time to purge itself of the opportunist pollution, because it was able to rid its ranks of the Liquidators and Mensheviks. Proletarian parties develop and become strong by purging themselves of opportunists and reformists, social-imperialists and social-chauvinists, social-patriots and social-pacifists.“

— Joseph Stalin

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„he Party is the highest form of organisation of the proletariat. The Party is the principle guiding force within the class of the proletarians and among the organisations of that class. But it does not by any means follow from this that the Party can be regarded as an end in itself, as a self-sufficient force. The Party is not only the highest form of class association of the proletarians; it is at the same time an instrument in the hands of the proletariatfor achieving the dictatorship, when that has not yet been achieved and for consolidating and expanding the dictatorship when it has already been achieved. The Party could not have risen so high in importance and could not have exerted its influence over all other forms of organisations of the proletariat, if the latter had not been confronted with the question of power, if the conditions of imperialism, the inevitability of wars, and the existence of a crisis had not yet demanded the concentration of all the forces of the proletariat at one point, the gathering of all the threads of the revolutionary movement in one spot in order to overthrow the bourgeoisie and to achieve the dictatorship of the proletariat. The proletariat needs the Party first of all as its General Staff, which it must have for the successful seizure of power. It scarcely needs proof that without a party capable of rallying around itself the mass organisations of the proletariat, and of centralising the leadership of the entire movement during the progress of the struggle, the proletariat in Russia could not have established its revolutionary dictatorship.“
— Joseph Stalin
„e achievement and maintenance of the dictatorship of the proletariat is impossible without a party which is strong by reason of its solidarity and iron discipline. But iron discipline in the Party is inconceivable without unity of will, without complete and absolute unity of action on the part of all members of the Party. This does not mean, of course, that the possibility of conflicts of opinion within the Party is thereby precluded. On the contrary, iron discipline does not preclude but presupposes criticism and conflict of opinion within the Party. Least of all does it mean that discipline must be "blind." On the contrary, iron discipline does not preclude but presupposes conscious and voluntary submission, for only conscious discipline can be truly iron discipline. But after a conflict of opinion has been closed, after criticism has been exhausted and a decision has been arrived at, unity of will and unity of action of all Party members are the necessary conditions without which neither Party unity nor iron discipline in the Party is conceivable.“
— Joseph Stalin
„When we are reproached with having established a dictatorship of one party and, as you have heard, a united socialist front is proposed, we say, "Yes, it is a dictatorship of one party! This is what we stand for and we shall not shift from that position because it is the party that has won, in the course of decades, the position of vanguard of the entire factory and industrial proletariat. This party had won that position even before the revolution of 1905. It is the party that was at the head of the workers in 1905 and which since then — even at the time of the reaction after 1905 when the working-class movement was rehabilitated with such difficulty under the Stolypin Duma — merged with the working class and it alone could lead that class to a profound, fundamental change in the old society.“
— Vladimir Lenin
„We declare war against socialism, not because it is socialism, but because it has opposed nationalism…. We intend to be an active minority, attract the proletariat away from the official Socialist party. But if the middle class thinks that we are going to be their lightning rods, they are mistaken.“
— Benito Mussolini
„But here is the "ego" of the Russian revolutionary again! Pirouetting on its head, it once more proclaims itself to be the all-powerful director of history — this time with the title of His Excellency the Central Committee of the Social Democratic Party of Russia.“
— Rosa Luxemburg
„Marxism was applied according to the concrete historical situation of Vietnam and because of the guiding role of the vanguard party, faithful to its people and consequently to its doctrine, a resounding victory was achieved over the (French) imperialists.“
— Ernesto Che Guevara