Sheehan v Australian Municipal, Administrative, Clerical and Services Union

Sheehan (the applicant) sought to restrain the Australian Municipal, Administrative, Clerical and Services Union (the respondent) from continuing its legal representation of a former client of the applicant's solicitors. The dispute concerned whether the respondent, through its solicitors, was in breach of confidentiality and acting in a conflict of interest by representing the former client in proceedings against the applicant. The matter came before Judge Burnett of the Federal Circuit Court of Australia.

The central legal issue before the Court was whether the respondent's solicitors were disqualified from acting for the former client due to a conflict of interest arising from their prior retainer by the applicant. This required the Court to consider the principles of solicitor-client confidentiality and the circumstances in which a solicitor's duty to a former client might preclude them from acting for a new client whose interests are adverse to the former client. The Court also considered the implied powers of the Federal Circuit Court to make orders necessary to prevent an abuse of process or to ensure the proper administration of justice.

Judge Burnett applied the established principles governing conflicts of interest in legal representation, which focus on whether the new retainer would inevitably involve the misuse of confidential information obtained during the former retainer, or whether the solicitor would be tempted to act against the former client's interests. The Court found that the solicitors had acted for the applicant in relation to the very matters that were the subject of the dispute with the former client. Consequently, there was a real and sensible risk that confidential information acquired during the earlier retainer could be used to the detriment of the applicant, or that the solicitors' duty to the applicant would conflict with their duty to the new client. The Court concluded that the solicitors were disqualified from acting for the respondent in these proceedings.

The Court ordered that the respondent's solicitors be restrained from acting for the respondent in the proceedings.