InsideClimate: When environmental journalist David Sassoon began reporting about the billionaire Koch brothers' interests in the Canadian oil industry last year, he sought information from their privately held conglomerate, Koch Industries. The brothers, who have gained prominence in recent years as supporters of and donors to conservative causes and candidates, weren't playing. Despite Sassoon's repeated requests, Koch Industries declined to respond to him or his news site, InsideClimate News.
But Sassoon,...