Lysander Spooner (1808–1887) is the American individualist anarchist and legal theorist known mainly for setting up a commercial post office in competition with the government and thereby being shut down. But he was also the author of some of the most radical political and economic writings of the 19th century, and continues to have a huge influence on libertarian thinkers today. He was a dedicated opponent of slavery in all its forms — even advocating guerrilla war to stop it — but also a dedicated opponent of the federal invasion of the South and its postwar reconstruction. See Let's Abolish Government, a collection selected personally by Murray Rothbard as Spooner's best work.
Ludwig von Mises: "We must comprehend that it is impossible to improve the economic conditions of the underdeveloped nations by grants in aid. If we send them foodstuffs to fight famines, we merely relieve their governments from the necessity of abandoning their disastrous agricultural policies." - Money, Method, and the Market Process