The charter reads as follows:
The Libertarian Party challenges the cult of the omnipotent state and defends the rights of the individual. All individuals have the right to control of their own lives and to live in whatever manner they choose, so long as they do not forcibly interfere with the equal right of others to live in whatever manner they choose. People should not be forced to sacrifice their lives and property for the benefit of others. I do not endorse the initiation of force for the achievement of social or political goals.
This charter contains excerpts of the U.S. national Libertarian Party Statement of Principles combined with the non-initiation of force pledge required to be an official member of the U.S. Libertarian Party.
It is open invitation but please enter only if you take the non-initiation of force to achieve social or political goals pledge seriously.
To join just use the Find button, the Groups tab, and enter Libertarian as a search term.
Wikipedia on Libertarianism