A federal judge on Friday ruled on behalf of Citizens United, a conservative advocacy group, in its lawsuit against the State Department for documents related to Hillary Rodham Clinton’s tenure there.

Judge Gladys Kessler of the United States District Court for the District of Columbia ordered the State Department to produce passenger manifests from 47 overseas trips that Mrs. Clinton made as secretary of state. Citizens United requested the manifests last July through a Freedom of Information Act Request.

The State Department, the judge wrote, must release the first batch of records by April 3, with more being released every two weeks; all the documents must be given to the group no later than Aug. 1.

The group requested the flight manifests to examine whether Clinton Foundation donors had accompanied Mrs. Clinton on State Department trips.

“Clearly, the State Department is not getting the benefit of the doubt from judges anymore,” David N. Bossie, president of Citizens United. said Friday.

A State Department spokeswomen did not immediately respond to a request for comment.

Citizens United has made 18 FOIA requests for information, none of which have been fulfilled. The group said it planned to file a lawsuit next week that would seek to gain access to documents that show any existing correspondence between senior State Department officials and donors to the Bill, Hillary & Chelsea Clinton Foundation.

Requests for public records requests have been complicated or made impossible because of Mrs. Clinton’s exclusive use of a private email address while she was at the State Department. The Associated Press filed a lawsuit this week against the State Department to force the release of outstanding documents requested through FOIA.

Citizens United has a history of litigation involving projects designed to portray Mrs. Clinton in a negative light. A lawsuit the group brought against the Federal Election Commission over its 2008 anti-Clinton documentary, “Hillary: The Movie,” reached the Supreme Court and led to a 2010 decision that overhauled campaign finance rules.