Ad Week reports that Tides Foundation founder and CEO Drummond Pike sent letters to 10 of Fox News' advertisers today “urging them to pull their spots.” The report adds:

Tides, a left-leaning public interest group has been a frequent on-air target of ultra-conservative Fox commentator Glenn Beck.

In his letter, Pike recounted the story of a gunman in the San Francisco area who was apprehended in July after a shootout with police and admitted that he had intended to storm the Tides offices and kill staffers there, including Pike. According to Pike's letter, the gunman acknowledged being inspired by Beck.

[...]

The letter was sent to JP Morgan Chase, Geico, Zurich Financial, Chrysler, Direct Holdings Americas (Time-Life), GlaxoSmithKline, AstraZeneca, Lilly Corporate Center, BP and The Hartford Financial Services Group. It was not immediately clear if any of the recipients would pull their ads.