Last week, ThinkProgress published an exclusive story about the U.S. Chamber of Commerce's foreign fundraising operation. We noted the Chamber raises money from foreign-owned businesses for its 501(c)(6) entity, the same account that finances its unprecedented $75 million dollar partisan attack ad campaign. While the Chamber is notoriously secretive, the thrust of our story involved the disclosure of fundraising documents U.S. Chamber staffers had been distributing to solicit foreign (even state-owned) companies to donate directly to the Chamber's 501(c)(6).