Fiona Glenanne was affiliated with the IRA for over a decade. However, she ran afoul of that organization because she hated being told what to do.
Since then, Fiona She has gone out on her own and is currently working with Michael Westen and Sam Axe, conducting odd jobs an working as a bounty hunter.
Michael: Jesse is investigating the same people we are. They nearly killed everyone at this table. I say we hear him out.
Fiona: Sure, get a guy fired, ruin his life. I'd say you owe him a Mojito and a friendly shoulder to cry on at the very least.
Michael: (Carefully opens the birthday gift box from Fiona) It's a bayonet.
Fiona: Used during the first world war for close fighting.
Michael: Fi, thanks.
Fiona: Well, someone once told me that caring for you is like trench warfare. (Michael casts a narrow glance at the kitchen where his mother is) So I thought you should arm yourself.