Larry David Grathwohl (October 13, 1947 – July 18, 2013)^[1] was a United States Army veteran and an Federal Bureau of Investigation informant in the 1970s. He infiltrated the Weather Underground^[2] and co-wrote a book about his experiences: Bringing Down America: An FBI informer with the Weathermen (1976).^[3][4]

This article relies excessively on references to primary sources. (June 2022)

Grathwohl was in the 2nd Battalion, 502nd Regiment, 101st Airborne Division from 1965 to 1966 and served in the Vietnam War. He became a sergeant.