 Among the activist participants were Jack Geiger and Victor W. Sidel.By the end of 1961, the group had drafted five research articles about the medical consequences of a ten megaton nuclear attack on the city of Boston, a magnitude considered both possible and likely by the U.S. military.The series, "The Medical Consequences of Thermonuclear War", was published as a symposium in the New England Journal of Medicine in May 1962.