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Last week, American billionaire industrialist David Koch died at age 79. He and his older brother Charles Koch ran Koch Industries, one of the world’s largest privately-held businesses. At the time of his death, David Koch was worth an estimated $42 billion. Over the last few decades, he and his brother gave massive amounts of money to support right-wing and libertarian causes by funding a vast and complicated network of think tanks, advocacy groups, and politicians in the U.S. Host Tamara Khandaker talks to Lisa Graves, director of Koch Docs, a searchable database of documents about Charles Koch and his empire. They walk through the history of the Koch family, and the way they’ve gone about exerting their influence in the political realm. See omnystudio.com/listener for privacy information.