In a closely watched case for nonprofit political groups that want privacy for their supporters, the U.S. Supreme Court on Thursday struck down a California law that says groups seeking tax-exempt status must tell the state the names of some of their biggest donors.

California has long insisted that it will not share the information it gathers, and legislative efforts aimed at beefing up security abound, but the state’s own history of data vulnerabilities undercut those assurances.

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