The US senator Dianne Feinstein, who has died aged 90, was long cherished by the CIA and others in the defence and intelligence community as someone whose staunch support they could rely on. Until one day they could not: on 11 March 2009 she launched an investigation into the CIA’s torture of detainees post-9/11.
That investigation by the Senate intelligence committee, which she chaired, turned into a bitter struggle with the agency and it tried to block it. She did not buckle and finally, in December 2014, she published her report, revealing the scale and brutality of what the CIA had done and its repeated attempts to mislead Congress and the White House. On top of all that, the report found the torture had proved counter-productive in obtaining valuable intelligence.
