Well, a level 1 contact is someone who is a friend of a friend- you got thier name, and you've been reccommended to them, so they'll do business, but they don't necessarily trust you.
Level 2 is someone who trusts you on a professional basis- they'll ditch you if you get too hot, though.
Level 3 is a friend- someone who has your back, and expects you to have thiers. They'll go to the ends of the earth to help cover your tracks, and expect you to help bury bodies in the middle of the night should they need it.
-kv