>> Im not in favor of websites that encourage copyright infringement
Neither am I.
>> but where does ICE get legal authority to seize these sites under existing law?
go to http://www.torrent-finder.com and read the notice. They got a warrant in U. S. District Court. All of the applicable laws are given by number, for your researching pleasure.
>> What law is ICE enforcing?
Again: go to the link. The specific laws they are enforcing are spelled out by U. S. C. number.
Thanks for the link. Just wondering since I couldn’t find it anywhere.