Legal groups behind the Janus case include the National Right to Work Legal Defense Foundation, The Center for Individual Rights and the Liberty Justice Center. All three of these groups operate as non-profits and have publicized some of their donors like the Walton Family Foundation (the non-profit established by the Wal-Mart Walton Family) and the Koch Brothers.
These groups have also received dark money from some conservative foundations. These foundations collect money secretly from big donors but hide their names. This allows these donors to give a lot of money without it being public. They are also able to receive larger tax write-offs than if they gave directly to the Right to Work Foundation. Some of the foundations that are supporting the Janus case include Donors Capital Fund, The Sarah Scaife Foundation, The Lynde and Harry Bradley Foundation, the Uihlein Family Foundation and the Dunn Foundation for the Advancement of Right Thinking.
While most of the donors to these foundations are unknown, EPI was able to find some names that have donated to them in the past. Donors Capital receives money from Charles Koch and the Richard and Helen DeVos Foundation, the foundation that was established by the billionaire father-in-law of Trump’s Education Secretary Betsy DeVos. The Sarah Scaife Foundation is financed by the fortune of robber baron Andrew Mellon.