Seymour Hersh's latest in The New Yorker

The Gray Zone - by Seymour M. Hersh

subtitle: How a secret Pentagon program came to Abu Ghraib.

The roots of the Abu Ghraib prison scandal lie not in the criminal inclinations of a few Army reservists but in a decision, approved last year by Secretary of Defense Donald Rumsfeld, to expand a highly secret operation, which had been focussed on the hunt for Al Qaeda, to the interrogation of prisoners in Iraq. Rumsfeld’s decision embittered the American intelligence community, damaged the effectiveness of élite combat units, and hurt America’s prospects in the war on terror.

According to interviews with several past and present American intelligence officials, the Pentagon’s operation, known inside the intelligence community by several code words, including Copper Green, encouraged physical coercion and sexual humiliation of Iraqi prisoners in an effort to generate more intelligence about the growing insurgency in Iraq. A senior C.I.A. official, in confirming the details of this account last week, said that the operation stemmed from Rumsfeld’s long-standing desire to wrest control of America’s clandestine and paramilitary operations from the C.I.A.

... and the article continues.