According to Jeffrey A. Winters, author of Oligarchy (Cambridge University Press, 2011), there’s the “income defense industry” which is composed of
[L]awyers, accountants, wealth management consultants, revolving-door lobbyists, think-tank debate framers and even key segments of the insurance industry whose sole purpose is income defense for America’s oligarchs. . . .
This legal, political and cultural power wielded by and on behalf of the super-wealthy 0.1% of our fellow Americans helps create and maintain the income inequality we have today. Frank Pasquale at Concurring Opinions has more (with lots of lovely links).