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.
On the day of publication, she told the Senate: “There are those who will seize upon the report and say ‘see what Americans did’, and they will try to use it to justify evil actions or to incite more violence. We cannot prevent that. But history will judge us by our commitment to a just society governed by law and the willingness to face an ugly truth and say ‘never again’.”
Her fight was dramatic enough to interest Hollywood, and the film The Report was released in 2019, with Feinstein played by Annette Bening.
What made her fight with the CIA so surprising was that it was out of kilter with her career before and after, as a Senate hawk. She voted for wars in Iraq and Afghanistan – though she later expressed regret over the former – supported Republicans in defence procurement projects and defended the spy agencies in controversies such as illegal mass surveillance in 2013.
Her reputation as a hawk frequently put her at odds with the Democratic left and this disillusionment with her grew rapidly in the latter part of her career.
In February this year, facing calls to stand down as her physical and mental health declined, she said she would not seek re-election in 2024.
There was much in her life she could look back on with pride: a trailblazer for women in politics; the calm leadership she displayed as mayor in San Francisco after the killings of her predecessor, George Moscone, and of Harvey Milk, one of the first openly gay men to be elected to an official position in the US; her success, albeit limited, in getting gun control through the US senate in 1994. But it was the torture report she cited as the achievement she was most proud.
The first she heard of the torture was in September 2006, when Feinstein and other members of the intelligence committee were privately briefed by the then head of the CIA, Michael Hayden. Although Hayden played down what the CIA euphemistically described as “enhanced interrogation techniques”, Feinstein was troubled by what she heard.
When she became chair of the intelligence committee in 2009 – its first female head – she launched the investigation. The final 6,700-page report remains classified, but she got around this by publishing a 500-page executive summary and that was damning enough.
Between 2002 and 2008 the CIA had detained 119 men at “black sites” – secret locations around the world – and of these 39 had been subjected to waterboarding, sleep deprivation, sexual humiliation, stress positions and “rectal rehydration”.
In 2015, Feinstein worked with the Republican senator John McCain in steering through the Senate an amendment that reinforced a ban on torture. The McCain-Feinstein amendment was the kind of bipartisan consensus that Feinstein, a centrist, valued. But, as US politics became more polarised, her attempts to work with Republicans increasingly grated with fellow Democrats.
When Donald Trump, as president, began to pack the supreme court with rightwingers, Democrats complained that Feinstein, who was the senior Democrat on the judiciary committee, did not put up enough of a fight. After the 2020 confirmation hearings of a Trump appointee, Amy Coney Barrett, Feinstein left Democrats seething when she hugged the chair, Republican Lindsey Graham.
Born in San Francisco, Dianne was the daughter of Betty (nee Rosenburg), a model, and Leon Goldman, a surgeon. Her family was affluent but she had a traumatic childhood: her mother was unstable and given to sudden rages due to an undiagnosed brain disorder. According to David Talbot, in his history of San Francisco in the 1960s through to the 80s, Season of the Witch (2012), Betty once chased her daughter with a knife around a dining table.
Dianne attended a convent school before going to Stanford University, where she graduated in 1955 with a bachelor’s degree in political science and history. She went on to secure a job on the state parole board. Although politics was overwhelmingly male-dominated, she was elected in 1969 on to the 11-member San Francisco board of supervisors, basically the city and county council. Runs for mayor in 1971 and 1975 proved unsuccessful.
In 1976, she was the target of a bomb attack on her home claimed by a California-based leftwing terrorist group, the New World Liberation Front. The bomb was planted in a window flower box but failed to go off. A few months later, another group, the Environmental Life Force, claimed responsibility for shooting out the windows of her holiday home with a BB gun.
She began to carry a concealed handgun for protection. In 1978, dispirited by the combination of the mayoral defeats and being targeted, she told a reporter she was on the verge of quitting politics.
Only hours after this exchange, the mayor of San Francisco, Moscone, and Milk, a fellow supervisor, were shot dead in City Hall by a former supervisor. Feinstein was the first into Milk’s office. She told the San Francisco Chronicle in 2008: “It was one of the hardest moments, if not the hardest moment, of my life.” Checking Milk for a pulse, one of her fingers slipped into a bullet hole.
As president of the board of supervisors at the time, she was well placed to take over as mayor, which she duly did, becoming the first female to occupy the post.
She served until 1988. With Aids rampant, she supported many initiatives to help the gay community. She secured federal funding for an overhaul of the cable car network, which proved popular with residents and tourists.
Influenced by seeing the damage to Milk’s body, she introduced in 1982 a local ordinance banning most residents from owning handguns. She had her own gun and 14 others that had been handed over in a buy-back scheme melted down and turned into a cross and given to Pope John Paul II on a visit to the Vatican.
After an unsuccessful bid to become governor of California in 1990, she was elected as a US senator from California in 1992. She quickly made an impact, guiding through in 1994 the Federal Assault Weapons Ban, outlawing civilian use of certain semi-automatic firearms, though with a proviso that it would expire in 2004 if not renewed, which it was not.
She was ranked in 2018 as the second wealthiest senator, with her fortune estimated at about $88m (about £74m).
Feinstein married three times: Jack Berman in 1956, with whom she had a daughter, Katherine, divorcing in 1959; Bertram Feinstein in 1962 until his death in 1978; and Richard Blum from 1980 to his death in 2022.
She is survived by Katherine, three stepdaughters, and a granddaughter, Eileen.
• Dianne Emiel Feinstein, US politician, born 22 June 1933; died 28 September 2023
• This article was amended on 2 October 2023 to say that Harvey Milk was one of the first openly gay men to be elected to an official position in the US rather than the outright first.
