Enver Hoxha: Marx and Engels created the proletarian science of the revolution and scientific socialism. They founded the International Workingmen's Association, known as the First International. The fundamental principles of this first international association of workers were formulated in its Constitutional Manifesto, which defined the road of the proletariat for the liquidation of private ownership of the means of production, for the creation of the party of the proletariat to seize state power on the revolutionary road, as well as for the struggle the proletariat had to wage against capitalism and opportunism, which presented itself in different "theoretical" forms in different countries. Vladimir Ilyich Lenin, the brilliant continuer of the work of Karl Marx and Frederick Engels, basing himself on their major works and defending them with rare mastery, waged the struggle against the trends of revisionists, opportunists, and other renegades. https://wordsmith.social/protestation/quotes#quote5645