Center for Responsive Politics:

Today we’re officially launching our newly redesigned Dark Money section,DarkMoney.org, tracking the activities of politically active nonprofits that don’t disclose their wealthy corporate and individual donors to the voters they seek to influence. This is the first phase of our Knight News Challenge project, Inside the 990 Treasure Trove, aimed at providing the public, journalists and policymakers access to data on dark money groups and clear information about how these groups operate.