MegaUpload are foreign. They're based in Hong Kong.

Also there were pretty high profile domain seizures done in two bouts over the last two years. ICE/DOJ seized domains (google it) - some of those were foreign based but with .com or .net. (I don't recall if any were foreign TLDs) There already doing anything they want anyway - and happily ignoring any due process - codifying these actions into law with PIPA/SOPA is just the icing on the cake.