Pretty true. In pure Anarchy there are not even recognized states, so there is no such thing as immigration, in the traditional sense of moving from under the authority of one government to under the authority of another government. Most Libertarians in the US are not full blown anarchists though, and still support the concept of a state. A lot of them even support the idea of taxation, but to a much more limited extent than is currently done, primarily for funding the police and the military, and little else. However, even these borderline Anarchists (I believe they are more correctly called Minarchists) tend to be for open borders. Just like Liberals and Conservatives, Libertarians have a spectrum of members. The pure free market Anarchists are at one extreme, and at the other extreme you have someone that looks a lot more like a conservative, although who isn't influenced by religion (so they hold conservative financial beliefs, support small government and light taxation, but they also tend to hold more mainstream liberal beliefs on social issues like gay marriage etc). Anarchist libertarians are beyond ultra conservatism with their financial beliefs (keep 100% of your money, zero taxation, zero government services, zero government regulations), and beyond ultra liberalism with their social beliefs (bare minimum laws, pretty much only don't steal kill or rape and derivatives of these things). The average libertarian is pretty similar to a mainstream conservative from a financial perspective (small government, little tax, few services, few regulations), and a mainstream liberal from a social perspective (few laws, relaxed laws, tolerance). And some of the particularly mild people who call themselves libertarians are closer to traditional conservatives than anything (low taxation, no socialized healthcare or foodstamp type programs but still things like police, military and even public schools), they are just less influenced by religion than the neoconservatives (gay marriage is fine, drugs are not such a big deal, laws can be relaxed a bit). A lot of the more mild libertarians probably used to be Republicans before fundamentalist Christians took the party over.