21 C.F.R. § 601.6
(a) Whenever the Commissioner has reasonable grounds to believe that any of the grounds for revocation of a license exist and that by reason thereof there is a danger to health, the Commissioner may notify the licensed manufacturer that the biologics license is suspended and require that the licensed manufacturer do the following:
(b) Upon suspension of a license, the Commissioner shall either:
[64 FR 56451, Oct. 20, 1999, as amended at 70 FR 14983, Mar. 24, 2005]