The Wikimedia Foundation is taking legal action against the NSA and the US Department of Justice over its programme of mass surveillance.
"By tapping the backbone of the internet, the NSA is straining the backbone of democracy," said Lila Tretikov, executive director of the Wikimedia Foundation, in a blogpost announcing the legal action.
Targeting the backbone means the NSA casts a "vast net" and inevitably scoops up data unrelated to any target and will also include domestic communications, violating the rules governing what the NSA can spy on, said Ms Tretikov.
The Snowden papers revealed that Wikipedia had been explicitly targeted for surveillance.
"By violating our users' privacy, the NSA is threatening the intellectual freedom that is central to people's ability to create and understand knowledge," said Ms Tretikov.
The NSA amd DoJ have yet to comment.