I'd do my job (or at least I'd like to think I would). If I was in the FBI, I'd have an obligation and job to do. I'd hope to be trained well enough not to be affected by my surroundings or the people. If it got to the point that I'd have to testify, then I'd know I did my job well.

HOWEVER -

If I was in La Costra Nostra, there's no way in Hell I'd put up with a rat bastard, and if I were Lefty and found out beforehand, I'd've taken care of the sonofabitch FBI agent.

It all depends on your persepective. The problem is getting personal when you mean business.

JG