Formed in 2004 as the Libertarian Party Radical Caucus, the caucus works to promote the libertarian philosophies of Murray Rothbard within the Libertarian Party. The caucus asks party members to sign the Rothbard Pledge. The pledge requires support for the Libertarian Party's platform with particular emphasis on the sections pertaining to the elimination of taxes and reduction of government.
He was frequently involved in the party's internal politics: from 1978 to 1983, he was associated with the Libertarian Party Radical Caucus, allying himself with Justin Raimondo, and Bill Evers and opposing the "low tax liberalism" espoused by 1980 presidential candidate Ed Clark and Cato Institute President Edward H Crane III.
He split with the Radical Caucus at the 1983 national convention, and aligned himself with what he called the "rightwing populist" wing of the party, notably Ron Paul, who ran for President on the LP ticket 1988.
Rothbard opposed what he considered the overspecialization of the academy and sought to fuse the disciplines of economics, history, ethics, and political science to create a "science of liberty," as reflected in his many books and articles.
Rothbard was born into a Jewish family in the Bronx.
Rothbard's books, such as Man, Economy, and State, Power and Market, The Ethics of Liberty, and For a New Liberty, are considered by some to be classics of natural law libertarian thought.
Rothbard defined the libertarian position through what is called the non-aggression principle, that "No person may aggress against anybody else." Rothbard attacked taxation as theft, because it was taking someone else's property without his consent.