Malthusianism is a bourgeois school represented by the British economist Malthus. Produced in the 18th century, Malthus proposed the "Malthusian Population Theory" in his representative works "Population Principle" and "Principles of Political Economy". Human beings must control the growth of population. Otherwise, poverty is the unchangeable destiny of mankind. He also proposed the alienation profit theory and the third party theory. That is to say, because of the existence of the "third party" composed of landlords, bureaucrats, priests, etc., they only buy but not sell, thus paying the profits of the capitalists and avoiding the crisis of overproduction caused by insufficient social consumption. Humans must control population growth. Otherwise, poverty is the unchangeable fate of mankind.

Are you talking about Niccolò Machiavelli? I only know that he proposed the theory of The Prince