LINCOLN, Neb. (AP) — An Omaha attorney who pleaded guilty last year to helping run a Ponzi scheme has agreed to give up his Nebraska law license.

The Nebraska Supreme Court on Friday accepted the voluntary surrender of Michael Kratville’s law license.

Kratville is one of three people indicted for operating a Ponzi scheme that swindled 100 people out of $4 million. He was found guilty in December of wire fraud. Prosecutors are seeking no more than seven years in prison for Kratville when he’s sentenced in April.

Authorities say Kratville and two other men operated two companies that guaranteed large returns and low risk to investors. Prosecutors say the men actually lost money and fraudulently hid their losses from investors.