In 1999, freelance historian Ben Green alleged that Kennedy falsified or misrepresented portions of "The Klan Unmasked". During the 1990s, Green had enlisted Kennedy's help while researching a book about the still unsolved murders of Florida couple Harry and Harriette Moore, black Civil Rights activists who died of injuries from the bombing of their home on Christmas Eve 1951. Green's book about the Moores, "Before His Time", was published in 1999. Green, whose book is generally disparaging of Kennedy, claimed to have examined Kennedy's archives at the Schomburg Center for Research in Black Culture in Harlem and Atlanta and he concluded that a number of interviews, portrayed in "I Rode With The Ku Klux Klan" as having been conducted undercover, had in fact been done openly, and that racist material amassed by Kennedy had also been openly obtained from mail subscriptions to the Klan and similar groups and not surreptitiously, as Kennedy implied. Most seriously, Green accused Kennedy of concealing the existence of a collaborator, referred to as "John Brown" (a pseudonym presumably chosen in honor of the 19th-century abolitionist John Brown). This pseudonymous collaborator, Green alleged, was in fact responsible for the most daring of Kennedy's undercover revelations.