Wikipedia's legal department joins the ACLU in this lawsuit to stop upstream (backbone) surveillance of anonymous readers and especially editors of the encyclopedia.
NSA Document identifying Wikipedia among other services for alleged illegal spying. pdf 
SAN FRANCISCO — TODAY, we’re filing a lawsuit against the National Security Agency to protect the rights of the 500 million people who use Wikipedia every month. We’re doing so because a fundamental pillar of democracy is at stake: the free exchange of knowledge and ideas. op-ed
The lawsuit argues that this broad surveillance, revealed in documents leaked by former NSA contractor Edward Snowden, violates the First Amendment by chilling speech and the open exchange of information, and that it also runs up against Fourth Amendment privacy protections. intercept
Our role at the Wikimedia Foundation is to protect Wikipedia, its sister projects, and the Wikimedia community of users. This means providing our users with the right conditions to facilitate their work, and protecting them when necessary. Defending the privacy of our editors, readers, and community is paramount to us. We believe privacy is essential to facilitating and advancing free knowledge. wikimedia