Marathon Pundit: San Francisco police union accuses Ayers in '70 bombing

Bill "Bomber" Ayers is back in the news, courtesy of the San Francisco Chronicle.

Leaders of San Francisco's police officers union have accused Weather Underground co-founder Bill Ayers and his wife, Bernardine Dohrn, of taking part in the 1970 bombing of a city police station that killed a sergeant.

The union leveled the charge in a letter to a conservative organization lobbying for arrests in the case, but said it had not been in contact with investigators and had no new evidence related to the bombing, which killed Sgt. Brian McDonnell.

Instead, the union cited information from a former Bay Area resident, Larry Grathwohl, who is working with the conservative group, America's Survival Inc. of Maryland. Grathwohl asserts that he infiltrated the Weather Underground as an FBI informant and heard Ayers confess to a role in the bombing.

Ayers has denied any involvement in the bombing and, in January, called Grathwohl a "paid dishonest person" in an interview with The Chronicle.