U.S. Supreme Court Will Hear Koch-Backed Challenge to Donor Law

The U.S. Supreme Court will take up a challenge by a Koch-backed group to a California law requiring charities disclose their largest donors to state officials.

The justices said Friday they would review the Americans for Prosperity Foundation appeal previously upheld by the San Francisco-based U.S. Court of Appeals for the Ninth Circuit.

The foundation linked to industrialist Charles Koch and his late brother, David, and joined by an unusually large number of supporters in the court case, say the law impinges on the right to freely associate with groups or organizations. They say it could expose donors to harassment ...