A former associate of a white supremacist group has pleaded guilty to bombing and murder charges and agreed to tell the authorities about his colleagues.

On Wednesday, Joann Wiggan, a telephone company employee, was arrested in connection with the case, and two other associates of Mr. Pellicano pleaded guilty to related charges several weeks ago.

His associates have also pleaded not guiltyand have posted bail.

Four former Revere employees and associates have pleaded guilty to related charges.

Mr. Keating and his associates pleaded not guilty to the state charges.

Mr. Felipe's closest associates have pleaded guilty to conspiracy to commit murder and assault.

Mr. Campbell, once considered a rising Democratic star with national prospects, has not been charged with any crime, though associates and campaign contributors have pleaded guilty.

Two associates involved in the scheme, including Mr. Olis's former boss, pleaded guilty last year and are expected to receive sentences of less than five years.

A former senior associate at Cravath, Swaine & Moore, the blue-chip Wall Street law firm, and his brother, pleaded guilty to insider trading.

This development occurred after an associate of the Bacon brothers, Dennis Karbovanec, pleaded guilty to his participation in the slayings.