A little added history, even though you didn't ask for it, Libertarian did come from the Left wing before it did the right wing, it was seen as a more socially liberal and smaller government version of the USSR, it was in opposition to the USSR, but understanding of the Economic values the USSR had, just not so much the social side of things. Although it is worth noting that Lenin decriminalized Homosexuality way before the americans even had the stonewall riots that led to it being decriminalized. Oh the irony. So yeah, Libertarian literally means someone who chases liberty but in the case of left wing libertarianism its more Social Liberty rather than Economic, we do have Economic liberty just its not in a capitalist system.
RE: How to: Anarchist