While it is widely known that some companies and foreign governments gave money to the foundations, perhaps in an effort to gain favor, one of the key parts of the puzzle hasn’t been reported: At least a dozen of those same companies lobbied the State Department, using lobbyists who doubled as major Clinton campaign fundraisers.

Those companies gave as much as $16 million to the Clinton charities. At least four of the lobbyists they hired are “Hillblazers,” the Clinton campaign’s name for supporters who have raised $100,000 or more for her current White House race. Two of the four also raised funds for Clinton’s unsuccessful 2008 presidential bid.

USA TODAY reached these conclusions by obtaining federal lobbying data from the nonpartisan Center for Responsive Politics for 2009-2013, Clinton’s tenure as secretary of State. Reporters then compared the data with donor lists made public by the Clinton nonprofits and federal campaign financial records.