Revelations that prominent radical activist Richard Aoki was an FBI informant have prompted angry denials among his supporters, but newly released records confirm he was secretly providing information to agents during the period he gave the Black Panthers guns and firearms training. The documents from Aoki's FBI informant file - totaling 221 pages - were released after a court challenge under the Freedom of Information Act and show that Aoki was an informant from 1961 to 1977, with only brief interruptions. The records say that at various points, he provided information that was unique" and of "extreme value." The records chronicle Aoki's 16-year career as an informant, including years in which he was a student at Merritt College in Oakland and at UC Berkeley, participating in the Black Panthers and other radical groups. They also cover years during which Aoki was a teacher at those universities. An early FBI report says Aoki was assigned the alias "Richard Ford" to use when signing reports, as well as a permanent informant number, which the FBI redacted. It notes his date of birth, his parents' names and his address. "Coverage furnished by this informant is unique and not available from any other source," the FBI report says. "Many activist individuals seek informant's advice and counseling since informant is considered as a militant who has succeeded within the establishment without surrending (sic) to it."