The Supreme Court on Wednesday will consider whether Abu Zubaydah, the first Sept. 11 terrorism suspect known to have been tortured by the United States overseas, can be told about his treatment, including where he was held.

The CIA captured Zubaydah in Pakistan 19 years ago, believing he was a high-ranking figure in Al Qaeda — a notion the CIA later concluded was wrong, according to a Senate Intelligence Committee study. His lawyers said he was held at several secret locations overseas, known as black sites, where during interrogations he was repeatedly waterboarded, slapped and slammed into walls, crammed into a small box, and deprived of sleep for days at a time.

In 2006 he was transferred to the custody of the Defense Department and moved to the U.S. military base at Guantanamo Bay, Cuba, where he remains. To help pursue legal claims against Polish officials who he says were complicit in his detention and treatment at a black site in Poland, he now wants access to two former CIA contractors who devised and helped carry out the U.S. torture program.

Read more: NBC News