the only ones that need to be worried right now are Iranians that think they’re gonna live.

Pete Hegseth, US Secretary of War

The term was original essentially a synonym for anarchist, being coined by Joseph Déjacque. Modern American libertarianism broke from its roots and promotes very un-anarchist perspectives. However, in my observation they do use anarchist framing and terminology. I view it as a right wing ideology for people who are attracted to the left. I believe, for this reason, libertarians are some of the easiest leftist converts.