PORTLAND (AP) — A former Oregon attorney and her husband have been indicted on accusations they took nuisance actions against the Internal Revenue Service employees investigating them.

Micaela Renee Dutson and her husband, Tony Dutson, were indicted last May on accusations of running an $8 million tax fraud scam.

A superseding indictment returned Wednesday by a federal grand jury in Portland alleges the couple tried to obstruct the IRS by filing baseless liens against four IRS workers. The liens claimed a debt owed by the employees to the Dutsons totaling $1 trillion.

The indictment alleges the Dutsons also helped file a frivolous lawsuit against an IRS agent and filed IRS forms that falsely claimed the payment of millions of dollars to the employees investigating them.

“The IRS works quickly to identify and stop these nuisance schemes aimed at harassing honest taxpayers and the government,” Eileen Mayer, chief of the IRS criminal investigation division, said in a statement Thursday.

“Today’s indictment signals our determination to hold accountable those who engage in this type of frivolous activity.”

The Dutsons, who have moved from the Portland area to Arizona, have yet to be arraigned on the obstruction charges and are not in custody. Last June, the couple pleaded not guilty to conspiracy to defraud the government and failure to file tax returns.

The indictment charges them with a conspiracy to market an illegal tax avoidance program, beginning in 1997 and continuing through at least October 2005.

Micaela Dutson resigned from the Oregon bar in 2002.