Why is the U.S. able to keep people in "Gitmo" without a fast and speedy trial?

guarenteed by the constitution? ... and if your answer is "because they're terrorist", first off i will be able to tell that you are a republican and live somewhere in the southern states, or have migrated from there, and secondly that is like saying "because he stole something" about someone suspected of stealing something... everyone is innocent until proven guilty to make sure the person is guilty before putting them through the penal system.