A white FBI agent has admitted that he and a number of white colleagues in the Chicago office planned a campaign of "retribution" against a black agent whose case has sparked a national debate over racism in the FBI, The New York Times reported Tuesday.

The disclosure, contained in court papers filed in Washington Friday, amounts to the first public acknowledgment by the bureau that white agents may have participated in harassment of agent Donald Rochon in Chicago where he was assigned from 1984 to 1986, the Times said.

According to the documents, the white agent, Gary W. Miller, also has conceded that in 1985 he forged Ro-chon's signature on an application for death and dismemberment insurance for the Rochon family.

Rochon, who has charged that while living in Chicago his family's safety was repeatedly threatened in anonymous telephone calls and racist letters from white FBI agents, has described the unsolicited insurance policy as a death threat.