45 CFR §500.2

1. (a)Counsel entering an appearance in a claim originally filed by a claimant in the claimant's own behalf, or upon request for a substitution of attorneys, will be required to file an authorization signed by the claimant.
2. (b)When counsel seeks to withdraw from the prosecution of a claim, he or she will be required to demonstrate that the client (claimant) has been duly notified.
3. (c)When a claimant advises the Commission that counsel no longer represents that claimant, a copy of the Commission's acknowledgment will be forwarded to that counsel.