ARI SHAPIRO, HOST: The U.S. Supreme Court today sided with rich donors and their desire to remain anonymous. By a 6-3 vote along ideological lines, the court struck down a California law requiring nonprofits to file a list of their large donors with the state. The court said the law subjected donors to potential harassment, chilling their speech in violation of the First Amendment. NPR's Domenico Montanaro joins us to explain the ruling. Hi there. DOMENICO MONTANARO, BYLINE: Hey, Ari. SHAPIRO: What were the details of this case? MONTANARO: Well, at issue here was a California law. It's similar to laws in other states. It requires tax-exempt charities or nonprofits to file a list of their large donors, anyone who gives over $5,000. It's the same as what these groups would provide to the IRS every year. Now, some of these groups use this status as a way to influence politics, and California wanted to crack down on the prevalence of some of these so-called dark money groups by following the money and looking for malfeasance and other problems. But because of these groups' statuses under the law, the names of the donors are supposed to remain private.