Kilmar Armando Abrego Garcia, who had been living in Maryland and legally protected from deportation, had been held in a Salvadoran prison since March 15.

It sounds like they’re accusing him of “trafficing” because he drove people to work. It sounds like a prosecutor resigned rather than prosecute him:

In recent weeks, a supervisor in the federal prosecutor’s office in Nashville resigned over how the case was handled, these people said.