David Koch, a billionaire American libertarian and influential donor to conservative causes, has died at age 79 after a long battle with cancer, his brother Charles said Friday.

Billionaire industrialist David Koch dies at age 79

The anti-war movement needs money, and the Koch brothers have it. But it comes with strings attached.

Opinion: When bad money supports good foreign policy

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Billionaire industrialist David Koch dies at age 79

Opinion: When bad money supports good foreign policy