Does a plaintiff have the privilege to represent other inmates as plaintiffs in his personal injury case?

To the extent plaintiff seeks to represent other inmates as plaintiffs in this suit, plaintiff is informed that pro se plaintiffs cannot represent anyone but themselves in their lawsuits. See, e.g., McShane v. United States, 366 F.2d 286, 288 (9th Cir. 1966) (privilege of appearing pro se is personal to plaintiff, and he has no authority to appear as an attorney for others than himself).