LITTLE ROCK, Ark. (AP) — Federal officials are searching for nine people who remain at large following this week's sweeping crackdown on corruption in eastern Arkansas.Fifty-one others — including five law enforcement officers — were arrested this week and are expected to be arraigned Thursday morning in federal court.FBI spokesman Steve Frazier says the bureau and other law enforcement agencies are still hunting for the last of the 70 people indicted on racketeering, money laundering and drug charges as part of the four-year investigation known as "Operation Delta Blues."Five of the people indicted were already in custody.U.S. Attorney Christopher Thyer says he expects some defendants to take guilty pleas "relatively quickly." He declined to say if any of the defendants had agreed to cooperate with the ongoing investigation.