Fact-checkers rely heavily on Wikipedia, and usually the best first pass at getting a read on a site is to read the Wikipedia article on it. But what’s the fastest way to get the relevant article?
As an example, consider the organization Nuclear Matters which describes itself this way:

Nuclear Matters is a national coalition with a diverse roster of allies and members. Our Advocacy Council is made up of leaders from various areas, including labor organizations, environmental supporters, young professionals and women in the nuclear industry, venture capitalists, innovators in advanced nuclear technology and former policymakers and regulators.
This site is not quite claiming to be grass roots, but we notice the one word not here is “industry-funded”. And we’re curious — you have some various members, but where does the money come from?
As mentioned, the best first stop on this is Wikipedia. I used to show students how to do the site search for Wikipedia using the “site:wikipedia.org” syntax — but I found even faculty I taught this to were forgetting the syntax — or searching for “wikipedia.com” which gives weird search results.
So I now just do this omnibar hack, using the URL to match against Wikipedia pages: