Say you are an engineer working for a gun manufacturer. You need to know how to manufacture the gun. You don't need to know what it is used for or by whom or even how much it is sold for.

If you are aware that a crime is going on you in principle are required to report it, but not doing so is not nearly at the same level of crime as actually doing the crime. So here I think the court will look at two things?

Did the engineer know that a crime was being committed?

Did the engineer personally benefit from the proceeds of the crime more than their ordinary salary?

I am not a lawyer though so don't take my advise.:-)