A law firm threatened to suspend or revoke your driver's license? The State issues driver's licenses as a privilege, and only it can suspend or revoke it (which can also occur by Court Order).
In which state do you live, and would you care to post a copy of this letter you received? Something doesn't sound right, so if we can see the letter, we might be able to provide more input on this issue.
i'm being threaten of callcelation of my drivers by a particular law firm- due too an incident that occured 1998.