Since both of the above versions of libertarianism have in common the fact that they support personal freedom, the term Civil Libertarian is often used for any person who advocates personal freedom, regardless of what other political views he or she may hold. The Political Compass is notable for using the term ''libertarianism'' to refer strictly to support for personal freedom.
Different types of Anarchism are sometimes referred to as libertarianism. The term ''libertarianism'' has been used for over a century as a synonym for ''anarchism''.Busky, Donald. ''Democratic Socialism: A Global Survey'', Praeger/Greenwood (2000), p. 4 ; Ward, Colin. ''Anarchism: A Very Short Introduction''. Oxford U Press (2004), p. 62
