The United States Court of Appeals for the Fifth Circuit in In re Grand Jury Proceedings held that a client's identity, fee and bonding arrangements may be privileged from disclosure by his attorney to the grand jury when such protection is necessary to preserve the client's privileged motive.
Lipman, Robert B.
"Evidence--Attorney-Client Relationship--Client's Identity Privileged,"
Mercer Law Review: Vol. 27:
4, Article 18.
Available at: https://digitalcommons.law.mercer.edu/jour_mlr/vol27/iss4/18