they are not even show trials

"It's a kangaroo court system and completely corrupt," said Michael Ratner, the president of the Centre for Constitutional Rights, which is co-ordinating investigations and appeals lawsuits against the government by some 1,000 lawyers. "Stalin had show trials, but at Guantanamo they are not even show trials because it all takes place in secret."
Combatant Status Review Tribunals were held for 558 detainees at the Guantanamo in 2004 and 2005. All but 38 detainees were determined to be "enemy combatants" who could be held indefinitely without charges. Detainees were not represented by a lawyer and had no access to evidence. The only witnesses they could call were other so-called "enemy combatants".