Found this:
https://sunlightfoundation.com/2015/12/03/behind-the-clinton-campaign-dark-money-allies/
"American Bridge 21st Century Foundation is another 501(c)(4) organization, also known as a dark money group. It runs Bridge Project, which says it’s “dedicated to opposing the conservative movement’s extreme ideology and exposing its dishonest tactics.” The site has a database, “Conservative Transparency,” that allows users to search for conservative donors, recipients and organizations. Featured donors include the Koch brothers and The Lynde and Harry Bradley Foundation.
American Bridge has funneled $3.7 million from its foundation arm to its super PAC in just the last two years — with donors safe in the knowledge that their names won’t ever be disclosed to the public.
The hilarious part (if you find dodging transparency hilarious) is that the group has an entire database for uncovering the money behind conservative causes, documenting spending from their 990s, and blogging about conservative donors, but it does not disclose its own donors on that website, or anywhere else. We reached out to American Bridge for comment on this, and will update this post if we receive anything from them.
On that note: The foundation arm of American Bridge 21st Century has donated a lot of money to the Bridge super PAC, which does have to disclose its donors. In the first six months of 2015, the foundation gave $1.2 million to the super PAC. In 2014, they donated $2.5 million. That’s $3.7 million dollars funneled from the foundation to the super PAC in just the last two years — with donors safe in the knowledge that their names won’t be disclosed to the public."
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