Agent Ramirez

Overall
Agent Ramirez is a FBI operative working in LA. He was later transferred to New York to observe the Doug and his friends.

Also to catch a wanted man named Dennis Quinn.

The Homeless Millionaire
Ramirez called Tony to a sit down one and offered him a deal. Work for them and clean up some loose ends or they take him down right then and there. Tony agreed to his terms and went along cleaning up his mess.

Later Tony was approached by Dennis Quinn a wanted man by the FBI. Dennis said once he's done everything they will throw him in prison unless he help Dennis out.

Tony and Dennis silently take out Ramirez's forces and soon Ramirez is called into a full retreat. Though it's unclear if Ramirez knew that Tony betrayed them or not, either way he leaves LA to go "deal with some business".