As Apple’s Tim Cook heads to the Senate today for a hearing, a new Congressional report finds the company “avoided billions in taxes in the United States and around the world through a web of subsidiaries so complex it spanned continents and went beyond anything most experts had ever seen.”

Maybe that’s why, as Sunlight Foundation reports, the top issue for Apple lobbyists over the years is “taxes." 

And those lobbyists know how government works. According to the Center for Responsive Politics, 25 of the 27 lobbyists Apple paid in the first quarter of 2013 are "revolvers,” or people who have previously worked in Congress or a federal agency.