At the center of the FBI's investigation into abuses at the Los Angeles County Jail was a top-secret program known as Operation Pandora's Box.
That investigation took a dramatic turn Wednesday with news that retired Los Angeles County Sheriff Lee Baca will plead guilty to a federal charge of making a false statement.
Here is a primer from The Times archives:
What was Operation Pandora's Box?
It was launched after sheriff's officials learned in the summer of 2011 that the FBI had enlisted Anthony Brown, an inmate...