WikiLeaks has been making headlines for more than a decade by releasing millions of classified documents, embarrassing governments while also raising fears that its activities may have put lives in danger.
Controversy also swirls around its founder Julian Assange, who was arrested on Thursday after being holed up in the Ecuadoran embassy in London for nearly seven years.
Here are five things to know about WikiLeaks.
WikiLeaks was founded in 2006 by Australian-born Assange, who said it would use encryption and a censorship-proof website to publish secret information and protect sources.
The worst scandals to affect WikiLeaks have been those involving Assange.
Hailed as a hero by supporters and reviled as a manipulator by critics, the white-haired Australian was holed up in the Ecuadoran embassy in London since 2012, when he was facing rape allegations in Sweden.
Swedish prosecutors dropped their investigation in 2017 but Assange remained in the embassy, fearing the US would extradite him for revealing state secrets.