Survivor

[Gmenfan]

I don't believe he ever stated what his job was. A federal agent can be many things. He could have been a pencil pusher.

http://www.thefreedictionary.com/federal+agent

Noun 1. federal agent federal agent - any agent or representative of a federal agency or bureau
agent
Indian agent - a representative of the federal government to American Indian tribes (especially on Indian reservations)
functionary, official - a worker who holds or is invested with an office
Fed, federal official, Federal - any federal law-enforcement officer
trustbuster - a federal agent who engages in trust busting