<p>House Republicans took aim yesterday at the fundraising vehicle that Democrats hope will help them equalize the money battle in the upcoming campaign -- organizations dubbed in political circles as "527s" or "501s," for sections of the tax code.</p>
<p>Rep. Robert W. Ney (R-Ohio), chairman of the House Administration Committee, was granted the power to subpoena leaders of six organizations seeking to mobilize voters in support of Democratic candidates after they refused to appear before the committee. Ney said they had "thumbed their noses" at the panel but declined to say whether he would exercise his subpoena power.</p>