WASHINGTON, Aug. 23 - The Bush administration is replacing the director of a small but critical branch of the Justice Department, months after he complained that senior political officials at the department were seeking to play down newly compiled data on the aggressive police treatment of black and Hispanic drivers.
The demotion of the official, Lawrence A. Greenfeld, whom President Bush named in 2001 to lead the Bureau of Justice Statistics, caps more than three years of simmering tensions over charges of political interference at the agency. And it has stirred anger and tumult among many Justice Department statisticians, who say their independence in analyzing important law enforcement data has been compromised.
Officials at the White House and the Justice Department said no political pressure had been exerted over the statistics branch. But they declined to discuss the job status of Mr. Greenfeld, who told his staff several weeks ago that he had been asked to move on after 23 years of generally high marks as a statistician and supervisor at the agency. Mr. Greenfeld, who was initially threatened with dismissal and the possible loss of some pension benefits, is expected to leave the agency soon for a lesser position at another agency.
With some 50 employees, the Bureau of Justice Statistics is a low-profile agency within the sprawling Justice Department. But it produces dozens of reports a year on issues like crime patterns, drug use, police tactics and prison populations and is widely cited by law enforcement officials, policy makers, social scientists and the news media. Located in an office separate from the Justice Department, it strives to be largely independent to avoid any taint of political influence.
The flashpoint in the tensions between Mr. Greenfeld and his political supervisors came four months ago, when statisticians at the agency were preparing to announce the results of a major study on traffic stops and racial profiling, which found disparities in how racial groups were treated once they were stopped by the police.
Political supervisors within the Office of Justice Programs ordered Mr. Greenfeld to delete certain references to the disparities from a news release that was drafted to announce the findings, according to more than a half-dozen Justice Department officials with knowledge of the situation. The officials, most of whom said they were supporters of Mr. Greenfeld, spoke on condition of anonymity because they were not authorized to discuss personnel matters.
Mr. Greenfeld refused to delete the racial references, arguing to his supervisors that the omissions would make the public announcement incomplete and misleading. Instead, the Justice Department opted not to issue a news release on the findings and posted the report online.
Some statisticians said that decision all but assured the report would get lost amid the avalanche of studies issued by the government. A computer search of news articles found no mentions of the study.
Congressional opponents of racial profiling, who have criticized what they see as an ambivalent stance on the issue by the Bush administration, said they were frustrated to learn that the Justice Department had completed the Congressionally mandated study without announcing its findings or briefing members of Congress on it. They accused the Justice Department of effectively burying the findings to play down new data that would add grist to the debate over using racial and ethnic data in law enforcement and terrorism investigations.
"My suspicions always go up if a report like this is just deep-sixed," said Representative John Conyers Jr., Democrat of Michigan, who is dean of the Congressional Black Caucus and plans to introduce legislation this fall that would ban the use of racial or ethnic police profiling.
The April study by the Justice Department, based on interviews with 80,000 people in 2002, found that white, black and Hispanic drivers nationwide were stopped by the police that year at about the same rate, roughly 9 percent. But, in findings that were more detailed than past studies on the topic, the Justice Department report also found that what happened once the police made a stop differed markedly depending on race and ethnicity.
