The thing is, often crimes aren't defined by laws. In Sweden we do define terrorism and terrorist organizations by the laws, and what the government designates

The thing is, often crimes aren't defined by laws. In Sweden we do define terrorism and terrorist organizations by the laws, and what the government designates as one is irrelevant. Meanwhile, most countries just declare "X is a terrorist organization", with this being done by politicians and where the organization often has no practical legal recourse. I think the US takes the second approach for the most part? You can't argue "X isn't a terrorist organization, it does violence, but it's an international armed conflict" or anything of the sort-- if the government thinks you support something they don't like they can get you by banning the group you're part of.