California Code, Corporations Code - CORP § 414

(a) No action shall be brought by or on behalf of any creditor to reach and apply the liability, if any, of a shareholder to the corporation to pay the amount due on such shareholder's shares unless final judgment has been rendered in favor of the creditor against the corporation and execution has been returned unsatisfied in whole or in part or unless such proceedings would be useless.

(b) All creditors of the corporation, with or without reducing their claims to judgment, may intervene in any such creditor's action to reach and apply unpaid subscriptions and any or all shareholders who hold partly paid shares may be joined in such action. Several judgments may be rendered for and against the parties to the action or in favor of a receiver for the benefit of the respective parties thereto.

(c) All amounts paid by any shareholder in any such action shall be credited on the unpaid balance due the corporation upon such shareholder's shares.