Koch emphasized rugged pursuits, taking his sons big-game hunting in Africa, and requiring them to do farm labor at the family ranch. The Kochs lived in a stone mansion on a large compound across from Wichita’s country club; in the summer, the boys could hear their friends splashing in the pool, but they were not allowed to join them. “By instilling a work ethic in me at an early age, my father did me a big favor, although it didn’t seem like a favor back then,” Charles has written. “By the time I was eight, he made sure work occupied most of my spare time.” David Koch recalled that his father also indoctrinated the boys politically. “He was constantly speaking to us children about what was wrong with government,” he told Brian Doherty, an editor of the libertarian magazine Reason, and the author of “Radicals for Capitalism,” a 2007 history of the libertarian movement.