A new documentary is paying tribute to Nasrin Sotoudeh, a prominent human rights lawyer described as “one of the bravest voices in Iran.” Known for taking on cases other lawyers are too afraid to, including representing women arrested for appearing in public without a hijab, the activist is currently in jail after being charged with spreading propaganda and conspiring to harm state security. Millions have called for Sotoudeh’s release, including Hillary Clinton, Christiane Amanpour, and Gloria Steinem. “Nasrin,” which made its world premiere last week at GlobeDocs Film Festival in Boston, implores others to join the #FreeNasrin movement.

“Without any costs, no society has achieved anything. All groups, and individuals, should be free from fear and threats,” says Sotoudeh in a new trailer for the film. She emphasizes, “We must not be silent.”

Virgil Films & Entertainment recently acquired North American rights to “Nasrin.” No word on a release date yet. “The Favourite’s” Olivia Colman narrates the doc, which was secretly filmed in Iran by women and men who risked arrest.