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>specific groups
The liberty movement, like its tenets, very decentralized, so it isn't defined by a single big group. There are a few prominent ones, however.
>GOP dissidents
Like you already mentioned, there's a small but dedicated corps of people in the Republican party that are going against the neocohen establishment. Mostly centered around supporters of Ron Paul before he retired and echoes of his presidential bid in 2012.
>Mises Institute
Probably the single largest advocate of Austrian economics and libertarian politics. Most of the bigwig libertarians post-Mises--Rothbard, Hoppe, Block, and others--have some association with it.
>Cato Institute
The Mises Institute's evil older brother. It was founded by Rothbard and David Koch a few years before the Mises Institute was, and for a brief period it served the same role that the Mises Institute does today. But the group has since broken its ties with Rothbardians and the Austrian School, along with anything that remotely looks like anarcho-capitalism, in an effort to be more relevant to public policy. Nowadays they're just a mouthpiece for milquetoast monetarist talking point
du jour. They're globalist controlled opposition, not really libertarian, but I feel need to mention them because normies often associate them with libertarians.
>Libertarian Party
Like the Cato Institue, controlled opposition that normies associate with libertarianism, but run by pot addicts rather than Chicago School cronies.
>Property and Freedom Society
Founded by Hans-Hermann Hoppe, it's like the Mises Institute of Europe, only more explicitly socially conservative and a little more elite.