Well, for starters, here is this little item:
Patriot Act reviewed in closed door session.
This article lays out many of the alarming aspects of the Act, and why the author considers them detrimental to our civil liberties.
I have a very long list of others I could post, but a simple keyword search will garner you the same results.
Oh, and Padilla is one detainee that comes to mind. There are many others who have 'disappeared'- granted, these are not very nice people, but that does not excuse our flouting of international law.