The Transport Workers' Union has ordered one of its branches to disband after an investigation found significant cultural and operational problems.
The TWU's national council made the decision on Tuesday to shut the Victorian and Tasmanian branch after an inquiry was carried out by retired judge Frank Marks.
His findings uncovered significant operational and cultural issues within the branch, including unfounded allegations of misconduct against former branch secretary Mem Suleyman.
Victorian and Tasmanian members will continue to be represented by the union under an interim governance arrangement by the national committee of management.
TWU national president Tim Dawson said the inquiry had uncovered both "serious operational and cultural problems within the branch".
"This decision has not been taken lightly," Mr Dawson said.
"However, we believe it is necessary to urgently address the systemic issues identified in Mr Marks' report and to refocus our efforts on what truly matters.
"Our priority is to rebuild trust, improve governance, and ensure the TWU can represent and advocate for members to the high standard they deserve."
The TWU said regular updates were provided to the Fair Work Commission throughout the investigation, including the report's findings and action.
