https://www.politico.com/news/2022/03/18/liberal-billionaire-nonprofit-dark-money-00018513 " Berger Action Fund, the nonprofit group, sent $31 million to the Sixteen Thirty Fund between April 2020 and March 2021, according to a new tax filing obtained by POLITICO. The Sixteen Thirty Fund has become a massive force on the left in recent years, growing from an operation that moved a few million dollars per year early in the last decade to a $400 million behemoth in the final year of Donald Trump’s presidency. "