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The identifying characteristics of Marxist biology are numerous. Salient among these is the rejection of Malthusian doctrine. As Margaret Sanger admitted, "A remarkable feature of Marxian propaganda has been the almost complete unanimity with which the implications of the Malthusian doctrines have been derided, denounced, and repudiated. Any defense of the so-called 'Law of Population' was enough to stamp one, in the eyes of the orthodox Marxians, as a 'tool of the capitalistic class,' seeking to dampen the ardor of those who expressed the belief that men might create a better world for themselves. Malthus, they claimed, was actuated by selfish motives. He was not merely a hidebound aristocrat, but a pessimist who was trying to kill all hope of human progress. By Marx, Engels, Bebel, Kautsky and the celebrated leaders and interpreters of Marx's great 'Bible of the Working Class' ... birth control has been looked upon as a subtle Machiavelian sophistry created for the purpose of placing the blame for human misery elsewhere than at the door of the capitalistic class. Upon this point the orthodox Marxian mind has been universally and sternly uncompromising. "

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