Yes, it is a scare tactic. A real live witness carries more impact than a name on a list.

Also, I am not talking about self-incrimination. I am talking about being used as a government witness. IMHO, pleading the Fifth would be the same as admitting you were a customer. Otherwise, you would just say you had never done business with these folks.

I didn't mean to stir up the pot. But, honestly, if they subpeonaed me, I think I'd have a stroke.