Larry Grathwohl considered Ayers and Dohrn the two top leaders of the organization .
Larry Grathwohl is an FBI informant who was with the Weatherman from autumn 1969 through spring 1970 .
Larry Grathwohl , an FBI informant who was with the Weatherman from autumn 1969 through spring 1970 , considered Ayers and Dohrn the two top leaders of the organization .