For those of you doubting (or were discussing it in 2009 anyway) whether Paulie or Jimmy would have whacked Karen... well, FWIW, their real life counterparts butchered Theresa Ferrara, a woman who was the girlfriend of pretty much everyone, for suspicion of her being an informant after the big Lufthansa heist.

I've heard they tortured her first by shoving broken glass down her throat, pouring acid on her, etc.

Edit: the way I wrote this makes it sound like they did this personally - they probably didn't