Dark Money dives into the depths of the greed and corruption in the American political system, revealing the story of the Koch brothers who have been enabling the ultra-wealthy to influence political decisions for decades.

'Follow the money' seems like a pretty common phrase in movies these days.

But did you know that it actually came from 'Deep Throat,' the FBI informant who identified a way to find corrupt politicians?

Although that was almost 40 years ago, we still have to worry about money's influence on government officials today.

Charles and David Koch, who have changed the face of politics with their access to massive financial assets, are behind this issue.

Learn all about their origins, methods, and impacts in Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right, written by investigative journalist and The New Yorker writer, Jane Mayer.