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, were not playing. Despite Sassoon's repeated requests, Koch Industries declined to respond to him or his news site, InsideClimate News.

But Sassoon, who also serves as publisher of the Pulitzer Prize-winning site, heard from the Kochs after his story was posted.

In a rebuttal posted on its website, KochFacts.com, the company asserted that Sassoon's story "deceives readers" by suggesting that Koch Industries stands to benefit from construction of the Keystone XL pipeline — a denial Sassoon included in his story. KochFacts went on to dismiss Sassoon as a "professional eco-activist" and an "agenda-driven activist."