Nonprofits known as 527s can raise unlimited sums for political spending. ProPublica is releasing a new database that will allow journalists, researchers and others to more easily search these organizations’ finances.

Every year, hundreds of millions of dollars flow through political organizations known as 527s. These organizations are not regulated by the Federal Election Commission and are not subject to FEC-style restrictions on who can contribute or how much they can give, though donations are not tax deductible. These groups are spending more and more, topping $1 billion in 2022. Use our database to explore who funds these organizations and how they’re spending the money.