A Republican operative in North Carolina has been charged in connection with a voter-turnout effort that investigators said was intended to manipulate the results of a now-overturned general election for Congress last year.

In an indictment announced on Tuesday, the operative, L. McCrae Dowless Jr., was accused of obstruction of justice and illegal possession of an absentee ballot, among other charges. Seven other people were also indicted in connection with the election fraud inquiry, but prosecutors said the charges against one person were inadvertent and would be dismissed.

In the indictment, prosecutors alleged that Mr. Dowless directed others in the criminal mishandling of absentee ballots and that “spoiled absentee ballots were counted.” Mr. Dowless’s crimes, the indictment said, “served to undermine the integrity of the absentee ballot process and the public’s confidence in the outcome of the electoral process.”