Chief Justice John G. Roberts had blocked a lower court order that would have required politically active nonprofits to disclose their donors. But on Tuesday the full Supreme Court overturned his stay.
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Republican strategist Karl Rove's Crossroads GPS group is planning to spend at least $23 million in key Senate races in the final two months of the campaign. The group is a tax-exempt non-profit and is allowed to keep the names of its donors secret.
Sheldon Adelson and his wife, Miriam, gave $92.8 million to conservative superPACs and related groups in the 2012 election, according to the Center for Responsive Politics.