Can a member of a class represent other members of the class in a class action?

It is one thing to say that some members of a class may represent other members in a litigation where the sole and common interest of the class in the litigation is either to assert a common right or to challenge an asserted obligation. It is quite another to hold that all those who are free alternatively either to assert rights or to challenge them are of a single class, so that any group merely because it is of the class so constituted, may be deemed adequately to represent any others of the class in litigating their interests in either alternative. Such a selection of representatives for purposes of litigation, whose substantial interests are not necessarily or even probably the same as those whom they are deemed to represent, does not afford that protection to absent parties which due process requires. The doctrine of representation of absent parties in a class suit has not hitherto been thought to go so far. (Hansberry v. Lee, supra.)