Ayiekie: A major difference is that many such countries actually enact laws forbidding membership in certain organizations (such as named terrorist groups). The US does not, quite, take that step, although the Patriot Act comes closer to it than we have since the McCarthy days. It's very thin constitutional ground, as it violates the protection of freedom of association.
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Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.
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Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.