Except many of the prisoners (not only of those in Guantanamo) were kidnapped by the CIA around the world during *illegal* operations.

There is a trial going in italy because an egyptian citizen (Abu Omar, an imam in italy) has been kidnapped and brought to a secret prison in egypt with a so-called "rendition flight". He was tortured on behalf of the usa's administration.

There are a number of this kind of "prisons" around the world, in coutries friendly to the usa, and you can bet they do not respect human rights there.