Four former or suspended Chicago police officers were convicted of shaking down undercover agents posing as drug pushers in the city's biggest police corruption case in years.

Three of them face sentences that could put them behind bars for the rest of their lives after Thursday's verdicts.U.S. Attorney Scott Lassar said it was "sad to see police officers who have betrayed their badge."

"But it's also a good day because these corrupt officers will no longer be on the street," he said. "It's a bittersweet day for law enforcement."