You know I am not to sure that they were all "suspected" at first. I think it became a place to send people you really didn't know what to do with, esp early on. Higher level people were sent other places. This was a good read that gave me some insight into the early days and what kinds of people were being shoveled off to Gitmo.
http://search.barnesandnoble.com/The...6011532/?itm=4
From what I can tell bad people were sent there, but they were not the majority.