Here's an excerpt that might help clarify:
Sanger suggested that Wikipedia’s editors have “systematically purged conservative mainstream media sources” because its editors “do not want what they dismiss as ‘misinformation,’ ‘conspiracy theories,’ etc., to get any hearing. In saying so, they (and similarly biased institutions) are plainly claiming exclusive control over what is thinkable. They want to set the boundaries of the debate, and they want to tell you how to think about it.”
Sanger noted that Wikipedia has banned Fox News’ political reporting, the New York Post, and the Daily Mail from being used as sources.
According to a Wikipedia page on the sources that can be used, other conservative websites such as Breitbart, The Blaze, The Daily Wire, The Gateway Pundit, and Newsmax are also banned.
“Many mainstream sources of conservative, libertarian, or contrarian opinion are banned from Wikipedia as well, including Quillette, The Federalist, and the Daily Caller,” he added. “Those might be contrarian or conservative, but they are hardly ‘radical’; they are still mainstream. So, how on earth can such viewpoints ever be given an airing on Wikipedia? Answer: often, they cannot, not if there are no ‘reliable sources’ available to report about them.”
“It is not too far to say that Wikipedia, like many other deeply biased institutions of our brave new digital world, has made itself into a kind of thought police that has de facto shackled conservative viewpoints with which they disagree,” Sanger wrote in a conclusion on his website. “Democracy cannot thrive under such conditions: I maintain that Wikipedia has become an opponent of vigorous democracy.”
