To have standing to move to disqualify another party’s attorney, the movant must generally be a present or former client of the challenged attorney, or at least a person who shared confidential information with that attorney in the course of a confidential or fiduciary relationship. Otherwise, the movant is generally not affected by any breach of the attorney’s duties of loyalty and confidentiality and so cannot be adversely affected by any supposed conflict of interest. This decision applies those rules to hold that a workers compensation insurer lacks standing to move to disqualify the injured worker’s attorney after the worker settled with an alleged third party tortfeasor, agreeing to indemnify the settling tortfeasor from claims by the employer and its insurer, and the worker’s attorney became co-counsel for the tortfeasor in opposing the workers compensation insurer’s cross-complaint to recoup the benefits it had paid the worker. The worker’s interests were not aligned with the employer’s, as the employer cannot recover its workers compensation benefits if it is found contributorily negligent in causing the worker’s injury.