ADVERSE INFLUENCES AND CONFLICTING INTERESTS. It is the duty of a member at the time of retainer to disclose to the client all the circumstances of his relations to the parties, and any interest in, or connection with the controversy which might influence the client in the selection of counsel.
It is unprofessional to represent conflicting interests, except by express consent of all concerned given after a full disclosure of the facts. Within the meaning of this rule, a member represents conflicting interests when, in behalf of one client, it is his duty to contend for that which duty to another client requires him to oppose.
The obligation to represent the client with undivided fidelity and not to divulge his secrets or confidences forbids also the subsequent acceptance of retainers or employment from others in matters adversely affecting any interest of the client with respect to which confidence has been reposed.