WASHINGTON -- A US grand jury in Guam opened an investigation of controversial lobbyist Jack Abramoff more than two years ago, but President Bush removed the supervising federal prosecutor, and the probe ended soon after.

The previously undisclosed Guam inquiry is separate from a federal grand jury in the District of Columbia that is investigating allegations that Abramoff bilked Indian tribes out of millions of dollars.

In Guam, a US territory in the Pacific, investigators were looking into Abramoff's secret arrangement with Superior Court officials to lobby against a court reform bill then pending in Congress. The legislation, since approved, gave the Guam Supreme Court authority over the Superior Court.

In 2002, Abramoff was retained by the Superior Court in what was an unusual arrangement for a public agency. The Los Angeles Times reported in May that Abramoff was paid with a series of $9,000 checks funneled through a Laguna Beach, Calif., lawyer to disguise the lobbyist's role working for the Guam court. No separate contract was authorized for Abramoff's work.

Guam court officials have never explained the contractual arrangement. At the time, Abramoff was a well-known lobbying figure in the Pacific islands because of his work for the Commonwealth of the Northern Mariana Islands and Saipan garment manufacturers, accused of employing workers in what critics called sweatshop conditions.

Abramoff spokesman Andrew Blum said the lobbyist ''has no recollection of his being investigated in Guam in 2002. If he had been aware of an investigation, he would have cooperated fully." Blum declined to respond to detailed questions.

The transactions were the target of a grand jury subpoena issued Nov. 18, 2002, according to the subpoena. It demanded that Anthony Sanchez, administrative director of the Guam Superior Court, turn over all records involving the lobbying contract, including bills and payments.

A day later, the chief prosecutor, US Attorney Frederick A. Black, who had launched the investigation, was demoted. A White House news release announced that Bush was replacing Black.

The timing caught some by surprise. Despite his officially temporary status as the acting US attorney, Black had held the assignment for more than a decade.

The acting US attorney was a controversial official in Guam. At the time he was replaced, Black was directing a long-term investigation into allegations of public corruption in the administration of then-Governor Carl Gutierrez. The probe produced numerous indictments, including some of the governor's political associates and top aides.

Black, 56, had served as acting US attorney for Guam and the Northern Mariana Islands since 1991, when he was named to the post by the president's father, President George H. W. Bush.

The career prosecutor, who held a senior position as first assistant before accepting the acting US attorney job, was demoted to a staff post. Black's demotion came after an intensive lobbying effort by supporters of Gutierrez, who had been publicly critical of Black and his investigative efforts.

Black declined to comment for this article.

His replacement, Leonardo Rapadas, was confirmed in May 2003 without any debate. Rapadas had been recommended for the job by the Guam Republican Party. Fred Radewagen, a lobbyist who had been under contract to the Gutierrez administration, said he carried that recommendation to top Bush aide Karl Rove in early 2003.

After taking office, Rapadas recused himself from the public corruption case involving Gutierrez. The new US attorney was a cousin of ''one of the main targets," according to a confidential memo to Justice Department officials.

Rapadas declined to comment and referred questions about his recusal to Justice Department officials who did not respond to requests for comment.

© Copyright 2006 Globe Newspaper Company.