According to The Glossary,
It has been said that a libertarian is just a Republican who does drugs. Most libertarians are in favor of free enterprise and a minimal (but nonzero) amount of government. There are some libertarians who are anarchists, and just to confuse things, anarchists used to call themselves libertarians. To confuse things further, there are the civil libertarians, who worry more about rights than about profits. Anyhow, the libertarian movement in America seems to have peaked, so you might
not have to worry about this kettle of fish for much longer.
Factsheet Five #44, August 1991