Groups Fight Regulation Requiring Donor Lists on Taxes

Eight conservative groups are backing an appeal to the Supreme Court over a controversial California regulation requiring nonprofits to disclose their big donors on a tax form, saying the rule tramples on donors' constitutional rights.

Mark Fitzgibbons of American Target Advertising, a direct marketing and fundraising agency for nonprofit organizations, accuses California Attorney General Kamala Harris of trying "to intimidate and silence conservatives."

They are among a slew of organizations and three states filing amicus briefs in the case. Other conservative organizations fighting the regulation are The Buckeye Institute, Cato Institute, Institute for Justice, and the Pacific Legal Foundation.