Film-maker whose documentary about Edward Snowden won an Oscar says she has been held for hours at a time by airport officials, told she was on a no-fly list and threatened with handcuffs for taking notes

The Oscar-winning documentary film-maker Laura Poitras is suing the US government demanding to know why she has repeatedly been subjected to “Kafkaesque harassment” at airports across the world.

Poitras, 51, said she had been held at borders more than 50 times between 2006 and 2012, often for hours at a time. At various times she alleges being told by officials that she was on a “no fly” list, having her electronic equipment confiscated and not returned for 41 days, and being threatened with handcuffs for taking notes. The latter incident took place when she was working on a film about the WikiLeaks founder Julian Assange.

Poitras said she was launching the legal action, which demands the release of all documentation held on her tracking, targeting and questioning by agencies over the six year period, following the failure of a 2013 freedom of information request.

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“I’m filing this lawsuit because the government uses the US border to bypass the rule of law,” said the film-maker in a statement, The Intercept reported. “This simply should not be tolerated in a democracy. I am also filing this suit in support of the countless other less high-profile people who have also been subjected to years of Kafkaesque harassment at the borders. We have a right to know how this system works and why we are targeted.”

Poitras has previously said she was placed on the Department of Homeland Security’s watch list in 2006 after returning home to the US following work on My Country, My Country. She says airport security told her officials had assigned her the highest “threat rating” possible, even though she had never been charged with a crime. She was repeatedly stopped until 2012, when the journalist Glenn Greenwald wrote an article about her experiences.

Poitras’s reporting on the NSA whistleblower Edward Snowden, along with work by Greenwald, Ewen MacAskill and Barton Gellman contributed to the Pulitzer prize for public service won jointly by the Washington Post and the Guardian in 2014. Her film on Snowden, Citizenfour, won the 2015 Oscar for best documentary.

The director is being represented by lawyers from digital-rights advocacy group the Electronic Frontier Foundation. “The well-documented difficulties Ms Poitras experienced while traveling strongly suggest that she was improperly targeted by federal agencies as a result of her journalistic activities,” senior counsel David Sobel told the Intercept. “Those agencies are now attempting to conceal information that would shed light on tactics that appear to have been illegal. We are confident that the court will not condone the government’s attempt to hide its misconduct under a veil of ‘national security.’”