 After the massacre of five left-wing anti-Klan demonstrators by Klansmen and neo-Nazis in Greensboro, N.C. in 1979 (an incident known as the Greensboro massacre), Levy came forward with information to help the victims in their attempt to win justice, although he did not agree with their Marxist politics.Paul Bermanzohn, one of the survivors of the neo-Nazi attack, recalled the efforts to establish in court that the FBI had possessed advance knowledge of the plot